video_core: Remove unnecessary enum class casting in logging messages

fmt now automatically prints the numeric value of an enum class member
by default, so we don't need to use casts any more.

Reduces the line noise a bit.

src/video_core/shader/decode/warp.cpp

@@ -27,7 +27,7 @@ OperationCode GetOperationCode(VoteOperation vote_op) {
     case VoteOperation::Eq:
         return OperationCode::VoteEqual;
     default:
-        UNREACHABLE_MSG("Invalid vote operation={}", static_cast<u64>(vote_op));
+        UNREACHABLE_MSG("Invalid vote operation={}", vote_op);
         return OperationCode::VoteAll;
     }
 }