Blender Git Loki

UI/Animation: Don't change Graph Editor cursor from scrubbing region

Do not execute the operator to change the Graph Editor cursor when changing the
active frame through the scrubbing region. This is not what users expect, see
T76599.

Removes an explicit exception to not let the regular frame change operator
execute in the Graph Editor. It was needed to let the cursor operator run
instead, but the interplay between the two operators is now handled at keymap
level.

Fixes T76599.