collab: Refine call buttons design (#35007)

Making icons consistent, adjusting spacing, and moving the "Leave Call"
button to be the very last, which makes more sense to me than the
"Share" button being the last. Sharing your project is still part of the
call, so in the left edge of the button strip is where, conceptually,
the option to end the call should be, I think!

Release Notes:

- N/A

assets/icons/audio_off.svg

@@ -1 +1,7 @@
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