tests: Rename actor-anchors to actor-pivot-point

The test only covers the pivot point now, rename to reflect this.

!1332
6 jobs for !1332 with gbsneto/clutter-cleanups-part1 in 9 minutes (queued for 2 seconds)
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Status Job ID Name Coverage
  Review
passed #785515
check-commit-log

00:00:43

 
  Build
passed #785516
build-mutter

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passed #785518
build-without-native-backend-and-wayland

00:03:22

passed #785517
build-without-opengl-and-glx

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  Test
passed #785520
can-build-gnome-shell

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passed #785519
test-mutter

00:04:53