Remove the `OPTYPE_REGISTER` flag, to ensure the operators do not pop up
their redo panel. The flag is removed where the operator properties are
set by Python code, instead of chosen by the user. For example, it doesn't
make much sense to change which bone collection is used by the operator by
typing the name of another bone collection.
This could be revisited when Blender supports "nested enum" properties,
to make it possible to choose an item in an entire hierarchy.
a582755321