Fix gitlab ci

This fixes the .gitlab-ci.yml file after !373 (merged) which changes a few path, breaking the detection for the continuous builds.

We now consider any change out of medialibrary and libvlc to be an application change, and deemed of a continuous-build job. It also includes the change from !385 (closed), since we need to build to be fixed for the pipeline to change, in order to fix both build & pipeline breakage