Correctly add STREAM_WEIGHT header in InboundHttp2ToHttpAdapter.onPushPromiseRead(...)

Motivation:

The weight header with the default value is not set but it should be (rfc7540#5.3.5: …Pushed streams initially depend on their associated stream … are assigned a default weight of 16).

Modifications:

Add STREAM_WEIGHT header.

Result:

Correctly add headers.

codec-http2/src/main/java/io/netty/handler/codec/http2/InboundHttp2ToHttpAdapter.java

@@ -303,6 +303,8 @@ public class InboundHttp2ToHttpAdapter extends Http2EventAdapter {
         }
 
         msg.headers().setInt(HttpConversionUtil.ExtensionHeaderNames.STREAM_PROMISE_ID.text(), streamId);
+        msg.headers().setShort(HttpConversionUtil.ExtensionHeaderNames.STREAM_WEIGHT.text(),
+                Http2CodecUtil.DEFAULT_PRIORITY_WEIGHT);
 
         processHeadersEnd(ctx, promisedStream, msg, false);
     }