pyqt5: remove old fixes

Since about 5 hydra evaluations ago the build log has:

substituteStream(): WARNING: pattern 'install_dir=pydbusmoddir' doesn't match anything in file 'configure.py'
substituteStream(): WARNING: pattern 'ModuleMetadata(qmake_QT=['webkitwidgets'])' doesn't match anything in file 'configure.py'

Looking at the original configure.py I don't see any mention of
pydbusmoddir and ModuleMetadata seems to be set like the patch suggests:

    'QtWebKitWidgets':      ModuleMetadata(
                                    qmake_QT=['webkitwidgets',
                                            'printsupport']),

It appears that we don't need the fix anymore.

Reverts: d3ed0ab3 ('PyQt: fix build')