gschema: Remove unused statusbar visibility configuration

Author: kaiw

data/org.gnome.meld.gschema.xml

@@ -52,12 +52,6 @@
           <summary>Show toolbar</summary>
           <description>If true, the window toolbar is visible.</description>
       </key>
-      <key name="statusbar-visible" type="b">
-          <default>true</default>
-          <summary>Show statusbar</summary>
-          <description>If true, the window statusbar is visible.</description>
-      </key>
-
 
       <!-- File loading settings -->
       <key name="detect-encodings" type="as">