#286 fix FastAPI example

nicegui/run_with.py

@@ -14,6 +14,7 @@ def run_with(
     binding_refresh_interval: float = 0.1,
     exclude: str = '',
 ) -> None:
+    globals.ui_run_has_been_called = True
     globals.title = title
     globals.favicon = favicon
     globals.dark = dark