data/ui/filediff.ui: Pad set labels for appearance purposes

Author: kaiw

data/ui/filediff.ui

@@ -187,6 +187,7 @@
                     <property name="visible">False</property>
                     <property name="can_focus">False</property>
                     <property name="receives_default">False</property>
+                    <property name="margin_left">12</property>
                     <child>
                       <object class="GtkLabel" id="filelabel2">
                         <property name="visible">True</property>
@@ -257,6 +258,7 @@
                     <property name="visible">False</property>
                     <property name="can_focus">False</property>
                     <property name="receives_default">False</property>
+                    <property name="margin_left">12</property>
                     <child>
                       <object class="GtkLabel" id="filelabel1">
                         <property name="visible">True</property>
@@ -327,6 +329,7 @@
                     <property name="visible">False</property>
                     <property name="can_focus">False</property>
                     <property name="receives_default">False</property>
+                    <property name="margin_left">12</property>
                     <child>
                       <object class="GtkLabel" id="filelabel0">
                         <property name="visible">True</property>