Update gnome-mpv to 0.15, fixes T7187
Summary:
Updates gnome mpv to the latest version avaliable.
Here is a short summary of the changes:
- Set default screenshot directory to XDG_PICTURES_DIR
- Improve handling of --window-scale, --autofit, --autofit-larger, and --autofit-smaller
- Add command line option for setting WM_ROLE
- Add context menu item for removing playlist items
- Add context menu item for copying location of playlist items
Test Plan: Played a sample video and verified in the about page that the version is 0.15
Reviewers: Triage Team, sunnyflunk
Reviewed By: Triage Team, sunnyflunk
Subscribers: sunnyflunk, robertgzr
Maniphest Tasks: T7187
Differential Revision: https://dev.getsol.us/D4324