Unlike other properties, "indirect only" restriction toggle doesn't
depend on parent. Meaning, when parent has the value disabled, it is
still possible to control the sub-collection value. That said, we don't
want to grey out the property when parent has the value `OFF`. To fix
this, remove the if condition which checks the parent value before
obtaining the value of current tree element. This `layer_collection_indirect_only`
is later used inside drawing code to set/unset the `UI_BUT_INACTIVE`
flag
See images in PR description
Pull Request: https://projects.blender.org/blender/blender/pulls/146010
e246838639