[css-values-4] Wrong determined type for asin, acos, atan, and atan2

[AtkinsSJ]

In https://drafts.csswg.org/css-values-4/#calc-type-checking, the determined types of all of the trigonometric functions are specified here:

sign() sin() cos() tan() asin() acos() atan() atan2() pow() sqrt() log() exp()
«[ ]» (empty map).

This means that asin(), acos(), atan(), and atan2() will all claim to return a <number>, when they actually return an <angle>. I believe these four should all return «[ "angle" → 1 ]» instead.

[tabatkins]

Correct; I might have written that when the functions were defined just over radians? Or I just messed up. Anyway yeah, the arc functions should return angles.

[cdoublev]

The wront type is from cc71452, which fixed #7486. Sorry, because I continued to expect these functions to output an angle but I did not spot the mistake.