[pitivi] prefs: Vertically center plugin switch

[Alexandru Băluț <alexbalut src gnome org>]

commit 7fb89fd8c6fcde176d8e128d48d5775ef15d6a68
Author: Elias Entrup <elias-git flump de>
Date:   Wed Mar 13 13:50:00 2019 +0100

    prefs: Vertically center plugin switch

 pitivi/dialogs/prefs.py | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/pitivi/dialogs/prefs.py b/pitivi/dialogs/prefs.py
index 628a30af..4aced8f1 100644
--- a/pitivi/dialogs/prefs.py
+++ b/pitivi/dialogs/prefs.py
@@ -625,6 +625,7 @@ class PluginPreferencesRow(Gtk.ListBoxRow):
             self._description_label.set_text(description)
 
         self.switch = Gtk.Switch()
+        self.switch.props.valign = Gtk.Align.CENTER
         self.switch_handler_id = None
 
         # Pack widgets.