niels/color_mode_selector_update

[n-poulsen]

• updates the "Color Mode" selector to only be visible for multi-animal projects (as "individual" labelling doesn't make sense in a single-animal setting)
• disables the cycling of color mode with the "F" shortcut when a multi-animal layer isn't active (so you can't change the color mode when working on a single-animal project)

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 90.62500% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 82.83%. Comparing base (358cd03) to head (ff8ae9a).

Files	Patch %	Lines
src/napari_deeplabcut/_widgets.py	90.62%	3 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #122 +/- ## ========================================== + Coverage 82.74% 82.83% +0.08% ========================================== Files 11 11 Lines 1837 1864 +27 ========================================== + Hits 1520 1544 +24 - Misses 317 320 +3 ```

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