Following {T54811} (and {rBbb92edd1c802}), DEG updates have been added
to the various operators. This has also been done for the layers
operators (see {rBf998bad211ae}, `ARMATURE_OT_bone_layers` has been
marked done in T54811). However, instead of `ARMATURE_OT_bone_layers`,
the update tagging actually happened for `POSE_OT_bone_layers`.
Now do this for `ARMATURE_OT_bone_layers` as well (keep it for
`POSE_OT_bone_layers`, dont think this is wrong there either).
Maniphest Tasks: T101046
Differential Revision: https://developer.blender.org/D15969
c350d97a2f