Move logic to else block to avoid unnecessary modifications

fastapi/applications.py

@@ -1057,6 +1057,7 @@ class FastAPI(Starlette):
                     f"configured in FastAPI. The configured root path is: "
                     f"{self.root_path}, the ASGI server root path is: {root_path}. "
                 )
+            else:
                 scope["root_path"] = self.root_path
                 path = scope.get("path")
                 if path and not path.startswith(self.root_path):