Clear transient screen errors and fix screen overlay in Command Sender

[jmthomas]

Prior to this fix if a screen in Command Sender has an error the entire Command Sender screen darkens.

• Go to INST SETPARAMS and edit the screen to add a bad item. Verify before and after behavior.

This also fixes the transient screen error issue.

• Got to Telemetry Viewer and open a few screens. Then zdocker pause cosmos-openc3-cosmos-cmd-tlm-api-1. Observe screen error (dimming). Then docker unpause cosmos-openc3-cosmos-cmd-tlm-api-1 and observe recovery.

closes #2720

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.31%. Comparing base (8112540) to head (3575c08).
⚠️ Report is 8 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2733      +/-   ##
==========================================
- Coverage   79.22%   78.31%   -0.92%     
==========================================
  Files         670      473     -197     
  Lines       54178    34451   -19727     
  Branches      734      734              
==========================================
- Hits        42924    26979   -15945     
+ Misses      11174     7392    -3782     
  Partials       80       80              

Flag	Coverage Δ
python	96.03% <ø> (+15.04%)	⬆️
ruby-api	84.19% <ø> (+0.04%)	⬆️
ruby-backend	82.23% <ø> (ø)

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