Color picker for board color cannot be focused by keyboard

[theoholl]

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Describe the bug
The color picker for the board color cannot be focused via keyboard (tabbing). This is an accessibility and convenience problem.

To Reproduce
Steps to reproduce the behavior:

1. In the left-side navigation go to section 'All boards'
2. Open the three-dot action menu of a board and click on 'Edit board'
3. Click into the text input field
4. Tab backwards to open the color picker (which will fail because the color picker is skipped)

Expected behavior
When tabbing backwards from the input form, the color picker should be the next focused element.

Screencast

Screencast.Bug.mp4