Make w shortcut non-looping

[daniel-wer]

See the linked issues/reports.
While I was at it, I removed an old keyboard shortcut which allowed to cycle between tools using 1 but only if a volume tool was active. Very confusing and inferior to the w shortcut imo.

The toggling is a little bit weird, because the "Eraser" appears twice (once for brushing, once for tracing) and the one for tracing is hidden by default unless the "Trace" tool is active. However, that has been the case before as well.

URL of deployed dev instance (used for testing):

• https://___.webknossos.xyz

Steps to test:

• Use w in an annotation to toggle through the tools. This should work reliably without jumping

Issues:

• fixes https://forum.image.sc/t/bug-w-shortcut-debouncing-in-volume-annotation-mode-not-working-correctly/59787
• fixes https://discuss.webknossos.org/t/toggling-modes-with-w-does-not-work-reliably/1676/2

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(Please delete unneded items, merge only when none are left open)

• Updated (unreleased) changelog
• Updated documentation if applicable
• Ready for review

[philippotto]

Great! Works well 👍