Avoid websocket ping back on fw upgrade via web UI form (#1574)

code/espurna/web.ino

@@ -327,7 +327,8 @@ void _onUpgradeData(AsyncWebServerRequest *request, String filename, size_t inde
             #endif
         }
     } else {
-        DEBUG_MSG_P(PSTR("[UPGRADE] Progress: %u bytes\r"), index + len);
+        //Removed to avoid websocket ping back during upgrade (see #1574)
+        //DEBUG_MSG_P(PSTR("[UPGRADE] Progress: %u bytes\r"), index + len);
     }
 }