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/node_helper.cpp

@@ -107,7 +107,7 @@ OperationCode SignedToUnsignedCode(OperationCode operation_code, bool is_signed)
         UNREACHABLE_MSG("Can't apply absolute to an unsigned integer");
         return {};
     default:
-        UNREACHABLE_MSG("Unknown signed operation with code={}", static_cast<u32>(operation_code));
+        UNREACHABLE_MSG("Unknown signed operation with code={}", operation_code);
         return {};
     }
 }