improv(circular): prevent caps from touching

[git-f0x]

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I noticed that the circular progress indicator in COSMIC Store became a full circle at some points, so this prevents that from happening.
The downside is that animations don't stay in sync across different-sized circulars if some of them hit the clamp.
But using different sized circulars near each other in apps is probably very unlikely (and the issue can be avoided if the bar is made thin enough).

Another nice side-effect is that the min gap and min size are the same now (instead of size being larger, and the gap being smaller than MIN_ANGLE), which also makes small circulars (with a high enough bar thickness) shrink to a dot at min size, which I think looks quite nice!

I removed BASE_ROTATION_SPEED, since it doesn't seem to change anything from my testing.

Before:

before.webm

After:

after.webm