Update matcha-gtk-theme to 20200618
- Fixed Mate panel issues
- Fixed metacity issues
Signed-off-by: Algent Albrahimi <firstname.lastname@example.org>
Test Plan: Switch system theme to all Matcha theme variants and check if they are working as expected.
Reviewers: Triage Team, JoshStrobl
Reviewed By: Triage Team, JoshStrobl
Differential Revision: https://dev.getsol.us/D9099