gsm-inhibit-dialog.ui: avoid deprecated GtkVBox

Author: sc0w

data/gsm-inhibit-dialog.ui

@@ -1,8 +1,8 @@
 <?xml version="1.0"?>
 <interface>
-  <requires lib="gtk+" version="2.16"/>
+  <requires lib="gtk+" version="3.22"/>
   <!-- interface-naming-policy toplevel-contextual -->
-  <object class="GtkVBox" id="main-box">
+  <object class="GtkBox" id="main-box">
     <property name="visible">True</property>
     <property name="border_width">6</property>
     <property name="orientation">vertical</property>