fix(app): clear <input> value after robot update file select

[mcous]

overview

In a small (code-wise) oversight, we forgot to clear the value of the <input type="file"> that drives the "robot update from file" flow. Without that value reset (as is present on the protocol upload input), the upload button can become "stuck" if you attempt to select the same file

Fixes #5781

changelog

• fix(app): clear value after robot update file select

review requests

1. Try to upload an "update" file that you know will cause an error (e.g. a random, non-update zip file)
2. After the update fails, try to upload a new, working file
   • Bonus points: have the second file have the exact same absolute path as the first file

• Second file triggers the update flow

risk assessment

Low; fixing a bug by mirroring implementation of the protocol file upload button which, once upon a time, had this exact same problem.

The component isn't covered by unit tests, which is a problem, though. See #5174 for tracking that lack of testing

[b-cooper]

Tested on robot, upload works after bad first file. 🍰