Bug 1796598 - Disable wait at RenderCompositorANGLE::WaitForGPU() on Windows until release r=gfx-reviewers,lsalzman

Since Bug 1793388 fix, a regression is not reported. Then it seems OK to enable it until release.

Differential Revision: https://phabricator.services.mozilla.com/D159913

modules/libpref/init/StaticPrefList.yaml

@@ -6464,7 +6464,7 @@
 # Disable wait of GPU execution completion
 - name: gfx.webrender.wait-gpu-finished.disabled
   type: bool
-#if defined(XP_WIN) && defined(NIGHTLY_BUILD)
+#if defined(XP_WIN)
   value: true
 #else
   value: false