preferences: Update Login Screen Support heading

Author: jlu5

variety/data/ui/PreferencesVarietyDialog.ui

@@ -3619,7 +3619,7 @@ To show the icon in the launcher choose About or Preferences. You may wish to lo
                         <property name="valign">start</property>
                         <property name="margin-left">15</property>
                         <property name="margin-top">18</property>
-                        <property name="label" translatable="yes">Login Screen Support</property>
+                        <property name="label" translatable="yes">Login &amp; Lock Screen Support</property>
                         <attributes>
                           <attribute name="weight" value="bold"/>
                         </attributes>