multimedia/py-gstreamer1: Fix packaging (+)

Some components was missed in last update:
Error: Orphaned: %%PYTHON_SITELIBDIR%%/gi/overrides/GstApp.py
Error: Orphaned: %%PYTHON_SITELIBDIR%%/gi/overrides/__pycache__/GstApp%%PYTHON_TAG%%.opt-1.pyc
Error: Orphaned: %%PYTHON_SITELIBDIR%%/gi/overrides/__pycache__/GstApp%%PYTHON_TAG%%.pyc

Reported by:	bulk -t
Approved by:	portmgr blanket (trivial fix)