Update Support-Dynamic-triple-double-buffering.patch

with a fix to the frame clock for a regression inherited from 45.1 (8f27ebf8) whereby it would enter triple buffering mode prematurely. And because it was premature, the clock would soon notice that triple buffering isn't required and drop back to double buffering. But the switch from triple to double buffering stalls the client frame queue by one frame which for some clients like Firefox is seen as a frame skip. (LP: #2046360)