fix(mission_planner): fix clear_mrm_route

[kosuke55]

Description

// Check reroute availability only when state is SET.
// This allows clear even if the module is running after the ARRIVED GOAL.

Tests performed

psim

Effects on system behavior

Not applicable.

Pre-review checklist for the PR author

The PR author must check the checkboxes below when creating the PR.

• I've confirmed the contribution guidelines.
• The PR follows the pull request guidelines.

In-review checklist for the PR reviewers

The PR reviewers must check the checkboxes below before approval.

• The PR follows the pull request guidelines.

Post-review checklist for the PR author

The PR author must check the checkboxes below before merging.

• There are no open discussions or they are tracked via tickets.

After all checkboxes are checked, anyone who has write access can merge the PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (765a596) 15.32% compared to head (841dd84) 12.35%.
Report is 147 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #5768       +/-   ##
===========================================
- Coverage   15.32%   12.35%    -2.98%     
===========================================
  Files        1721        9     -1712     
  Lines      118559     1109   -117450     
  Branches    37995      394    -37601     
===========================================
- Hits        18169      137    -18032     
+ Misses      79657      763    -78894     
+ Partials    20733      209    -20524     

Flag	Coverage Δ
differential	12.35% <ø> (?)
total	?

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.