[pitivi] timeline: Fix add effect keyboard shortcut

[Alexandru Băluț <alexbalut src gnome org>]

commit b3fd4f52e9a8025e63283ff19e00e8eb9377cbe3
Author: Alexandru Băluț <alexandru balut gmail com>
Date:   Fri Mar 5 21:20:23 2021 +0100

    timeline: Fix add effect keyboard shortcut

 pitivi/timeline/timeline.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/pitivi/timeline/timeline.py b/pitivi/timeline/timeline.py
index c9983464d..5da067ecd 100644
--- a/pitivi/timeline/timeline.py
+++ b/pitivi/timeline/timeline.py
@@ -2065,7 +2065,7 @@ class TimelineContainer(Gtk.Grid, Zoomable, Loggable):
         self.timeline.scroll_to_playhead(align=Gtk.Align.CENTER, when_not_in_view=True)
 
     def __add_effect_cb(self, unused_action, unused_parameter):
-        clip = self.timeline.selection.getSingleClip()
+        clip = self.timeline.selection.get_single_clip()
         if clip:
             self.effects_popover.set_relative_to(clip.ui)
             self.effects_popover.popup()