Hacky code for attaching GSettings in our Apport hooks

[Sergey "Shnatsel" Davidoff]

The code for attaching GSettings for our apps from Apport hooks is rather hacky and duplicated in each hook.

Looks like there's a more proper facility for doing that. Here's what I've found in /usr/lib/python3/dist-packages/apport/packaging_impl.py:

    def get_modified_conffiles(self, package):
        '''Return modified configuration files of a package.

        Return a file name -> file contents map of all configuration files of
        package. Please note that apport.hookutils.attach_conffiles() is the
        official user-facing API for this, which will ask for confirmation
        and allows filtering.