video/timecode: Use stringify!($name) instead of "$name" in Debug impl

Otherwise it would output a literal "$name" string.

gstreamer-video/src/video_time_code.rs

@@ -321,7 +321,7 @@ macro_rules! generic_impl {
 
         impl fmt::Debug for $name {
             fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
-                f.debug_struct("$name")
+                f.debug_struct(stringify!($name))
                     .field("fps", &self.get_fps())
                     .field("flags", &self.get_flags())
                     .field("latest_daily_jam", &self.get_latest_daily_jam())