Make "Up" and "Overflow" menu icons more visible in AccountProfile #3272
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The toolbar in AccountProfile is transparent, so any profile image the user has chosen is shown under it.
This makes the "Up" and "Overflow" menu icons also have transparent backgrounds.
Consequently, they can be hard to spot, or possibly invisible, on backgrounds that are very dark or very light.
Fix this by compositing the icons in a LayerDrawable, with a circular background identical to the surface colour. This ensures they stand out against the background image, and blend in when the user scrolls.
Fixes #2723