x11-wm/gamescope: unbreak fetch due to repo growth

fetch: https://github.com/Plagman/gamescope/commit/a618ea074660.patch: size mismatch: expected 2587, actual 2589

-index 5a47ff84..bba9ec84 100644
+index 5a47ff840..bba9ec849 100644

(cherry picked from commit 9b5261b7e82ef446d04052135490f696b2e98e55)