[iOS] Fix pending format inconsistencies

[aringenbach]

Fixes element-hq/element-x-ios#1672

Also fixes a related issue where de-selecting and selecting a list item back would not apply the formats either.
Added ViewModel unit tests for both cases.

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
No Duplication information

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (861ea18) 89.85% compared to head (e1c4d66) 88.63%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #823      +/-   ##
==========================================
- Coverage   89.85%   88.63%   -1.23%     
==========================================
  Files         113      114       +1     
  Lines       16240    16253      +13     
  Branches      604      613       +9     
==========================================
- Hits        14593    14406     -187     
- Misses       1623     1818     +195     
- Partials       24       29       +5     

Flag	Coverage Δ
uitests	?
uitests-ios	?
unittests	88.63% <93.75%> (+0.09%)	⬆️
unittests-ios	76.57% <93.75%> (+1.12%)	⬆️
unittests-rust	89.88% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...WysiwygComposerView/WysiwygComposerViewModel.swift	82.37% <100.00%> (-9.06%)	⬇️
...es/WysiwygComposer/Extensions/ComposerAction.swift	87.50% <87.50%> (ø)

... and 7 files with indirect coverage changes

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[alfogrillo]

LGTM