fix(api): remove homing patch fix for right mount when a 96-channel i…

…s attached (#14975)

<!--
Thanks for taking the time to open a pull request! Please make sure
you've read the "Opening Pull Requests" section of our Contributing
Guide:


https://github.com/Opentrons/opentrons/blob/edge/CONTRIBUTING.md#opening-pull-requests

To ensure your code is reviewed quickly and thoroughly, please fill out
the sections below to the best of your ability!
-->

# Overview
We now [unconditionally home the
axis](#14955) before
performing the homing move so we can now remove this patch. If we leave
this in, the head R is going to raise an error when the robot boots up
the first time because it will not be able to update the position
estimation.
<!--
Use this section to describe your pull-request at a high level. If the
PR addresses any open issues, please tag the issues here.
-->

# Test Plan

<!--
Use this section to describe the steps that you took to test your Pull
Request.
If you did not perform any testing provide justification why.

OT-3 Developers: You should default to testing on actual physical
hardware.
Once again, if you did not perform testing against hardware, justify
why.

Note: It can be helpful to write a test plan before doing development

Example Test Plan (HTTP API Change)

- Verified that new optional argument `dance-party` causes the robot to
flash its lights, move the pipettes,
then home.
- Verified that when you omit the `dance-party` option the robot homes
normally
- Added protocol that uses `dance-party` argument to G-Code Testing
Suite
- Ran protocol that did not use `dance-party` argument and everything
was successful
- Added unit tests to validate that changes to pydantic model are
correct

-->

# Changelog

<!--
List out the changes to the code in this PR. Please try your best to
categorize your changes and describe what has changed and why.

Example changelog:
- Fixed app crash when trying to calibrate an illegal pipette
- Added state to API to track pipette usage
- Updated API docs to mention only two pipettes are supported

IMPORTANT: MAKE SURE ANY BREAKING CHANGES ARE PROPERLY COMMUNICATED
-->

# Review requests

<!--
Describe any requests for your reviewers here.
-->

# Risk assessment

<!--
Carefully go over your pull request and look at the other parts of the
codebase it may affect. Look for the possibility, even if you think it's
small, that your change may affect some other part of the system - for
instance, changing return tip behavior in protocol may also change the
behavior of labware calibration.

Identify the other parts of the system your codebase may affect, so that
in addition to your own review and testing, other people who may not
have the system internalized as much as you can focus their attention
and testing there.
-->

api/src/opentrons/hardware_control/ot3api.py

@@ -1522,14 +1522,8 @@ async def _home_axis(self, axis: Axis) -> None:
         # G, Q should be handled in the backend through `self._home()`
         assert axis not in [Axis.G, Axis.Q]
 
-        # TODO(CM): This is a temporary fix in response to the right mount causing
-        # errors while trying to home on startup or attachment. We should remove this
-        # when we fix this issue in the firmware.
-        enable_right_mount_on_startup = (
-            self._gantry_load == GantryLoad.HIGH_THROUGHPUT and axis == Axis.Z_R
-        )
         encoder_ok = self._backend.check_encoder_status([axis])
-        if encoder_ok or enable_right_mount_on_startup:
+        if encoder_ok:
             # enable motor (if needed) and update estimation
             await self._enable_before_update_estimation(axis)