Update matcha-gtk-theme to 20200509
- Fixed gnome-shell dash to dock issues
Signed-off-by: Algent Albrahimi <email@example.com>
Test Plan: Switch system theme to all Matcha theme variants and check if they are working as expected.
Reviewers: Triage Team, DataDrake
Reviewed By: Triage Team, DataDrake
Differential Revision: https://dev.getsol.us/D8838