http2: set response_frame_size

Ticket: 8410

Do not set only request_frame_size whatever the direction

(cherry picked from commit 7b0528d85f)

rust/src/http2/http2.rs

@@ -1028,7 +1028,11 @@ impl HTTP2State {
                             );
                         } else {
                             self.set_event(HTTP2Event::LongFrameData);
-                            self.request_frame_size = head.length - (rem.len() as u32);
+                            if dir == Direction::ToServer {
+                                self.request_frame_size = head.length - (rem.len() as u32);
+                            } else {
+                                self.response_frame_size = head.length - (rem.len() as u32);
+                            }
                         }
                     }