Bug 1423814 - av1: re-enable decoder on 32-bit nightly. r=kinetik

Revert the work-around from bug 1421635 now that the upstream
fix is applied.

MozReview-Commit-ID: GwmXr8zVBGn

--HG--
extra : rebase_source : 253428fac503e8820856b371e44aaa963e932e29

toolkit/moz.configure

@@ -375,7 +375,7 @@ option('--enable-av1',
 def av1(value, target, milestone):
     enabled = bool(value)
     if value.origin == 'default' and milestone.is_nightly:
-        enabled = target.os != 'Android' and target.cpu != 'x86'
+        enabled = target.os != 'Android'
     if enabled:
         return True