fix streaming url

Signed-off-by: marcin mikołajczak <git@mkljczk.pl>

app/soapbox/features/ui/index.tsx

@@ -336,7 +336,7 @@ const UI: React.FC = ({ children }) => {
 
   const dropdownMenuIsOpen = useAppSelector(state => state.dropdown_menu.openId !== null);
   const accessToken = useAppSelector(state => getAccessToken(state));
-  const streamingUrl = instance.configuration.getIn(['urls', 'streaming_api']);
+  const streamingUrl = instance.configuration.getIn(['urls', 'streaming']);
   const standalone = useAppSelector(isStandalone);
 
   const handleDragEnter = (e: DragEvent) => {