[pitivi] Fix pylint bad-indentation

[Thibault Saunier <tsaunier src gnome org>]

commit 57524beba080baa38f93e04e2b783041ca349a33
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Oct 25 18:24:02 2019 +0200

    Fix pylint bad-indentation

 pitivi/viewer/title_overlay.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/pitivi/viewer/title_overlay.py b/pitivi/viewer/title_overlay.py
index 4581051f..11a0f797 100644
--- a/pitivi/viewer/title_overlay.py
+++ b/pitivi/viewer/title_overlay.py
@@ -38,7 +38,7 @@ class TitleOverlay(Overlay):
     def on_async_done(self, unused_pipeline):
         # Only update on_async when we are not dragging
         if isinstance(self.stack.click_position, numpy.ndarray):
-                return
+            return
         self.update_from_source()
 
     def __draw_rectangle(self, cr):