Bump sleep on activities screenshot test

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

app/src/androidTest/java/com/nextcloud/client/ActivitiesActivityIT.kt

@@ -174,7 +174,7 @@ class ActivitiesActivityIT : AbstractIT() {
             sut.dismissSnackbar()
         }
 
-        shortSleep()
+        longSleep()
         waitForIdleSync()
 
         screenshot(sut)