[shotwell] Fix indentation on preferences dialog

[Jens Georg <jensgeorg src gnome org>]

commit 9725ec5ab12ba789714d94ced60219e7d22151f1
Author: Jens Georg <mail jensge org>
Date:   Wed May 9 07:44:26 2018 +0200

    Fix indentation on preferences dialog

 ui/preferences_dialog.ui |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/ui/preferences_dialog.ui b/ui/preferences_dialog.ui
index 5f2e685..f020c97 100644
--- a/ui/preferences_dialog.ui
+++ b/ui/preferences_dialog.ui
@@ -436,7 +436,8 @@
                   <object class="GtkLabel">
                     <property name="visible">True</property>
                     <property name="can_focus">False</property>
-                    <property name="halign">end</property>
+                    <property name="halign">start</property>
+                    <property name="margin_left">10</property>
                     <property name="label" translatable="yes">Use dark theme:</property>
                   </object>
                   <packing>