clutter/actor: Remove superfluous line

This sets exactly the same thing as the line above and doesn't
manipulate any parts of the calculation, too, it's most likely a very
old copy-paste mistake, remove it.

Thanks to Rafał Mikrut for discovering it.

Fixes GNOME/mutter#1222
13 jobs for fix-clutter-actor-copy-paste
Status Job ID Name Coverage
  Review
manual #1062851
manual
check-commit-log
manual #1062852
manual
check-merge-request
 
  Prepare
created #1062854
aarch64
build-fedora-container@aarch64
created #1062853
build-fedora-container@x86_64
 
  Build
created #1062856
aarch64
build-mutter@aarch64
created #1062855
build-mutter@x86_64
created #1062858
build-without-native-backend-and-wayland@x86_64
created #1062857
build-without-opengl-and-glx@x86_64
 
  Test
created #1062861
can-build-gnome-shell@x86_64
created #1062860
aarch64
test-mutter@aarch64
created #1062859
test-mutter@x86_64
 
  Coverage
created #1062863
aarch64
test-mutter-coverage@aarch64
created #1062862
test-mutter-coverage@x86_64