src: remove redundant cast in node_http2.h

PR-URL: #25978
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Daniel Bevenius <daniel.bevenius@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_http2.h

@@ -388,7 +388,7 @@ class Http2Options {
   }
 
   void SetPaddingStrategy(padding_strategy_type val) {
-    padding_strategy_ = static_cast<padding_strategy_type>(val);
+    padding_strategy_ = val;
   }
 
   padding_strategy_type GetPaddingStrategy() const {