fetchActions: Compare all routes to 'main', not just the first.

I think we generally expect the 'main' route to be index zero of the
routes, when it's among the routes. But it's not obvious that this
will always hold, and it's quite easy to check all the routes.

Author: chrisbobbe

src/message/fetchActions.js

@@ -163,7 +163,7 @@ const initialFetchCompletePlain = (): Action => ({
 });
 
 export const initialFetchComplete = () => async (dispatch: Dispatch, getState: GetState) => {
-  if (getNavigationRoutes()[0] !== 'main') {
+  if (!getNavigationRoutes().some(navigationRoute => navigationRoute.routeName === 'main')) {
     // If we're anywhere in the normal UI of the app, then remain
     // where we are. Only reset the nav state if we're elsewhere,
     // and in that case, go to the main screen.