ui: Untabify all files

We want spaces there. The top-panel was the first offender
but let's get the others correct too.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>

src/ui/home.ui

@@ -21,7 +21,7 @@
               <object class="GtkRevealer" id="rev_home">
                 <property name="visible">True</property>
                 <property name="reveal-child">True</property>
-		<property name="transition-type">crossfade</property>
+                <property name="transition-type">crossfade</property>
                 <child>
                   <object class="GtkButton" id="btn_home">
                     <property name="visible">True</property>

src/ui/settings-menu.ui

@@ -213,14 +213,14 @@
                 </style>
               </object>
             </child>
-	    <child>
+            <child>
               <object class="PhoshMediaPlayer" id="media_player">
                 <property name="visible" bind-source="media_player" bind-property="playable" bind-flags="sync-create"/>
                 <property name="valign">center</property>
                 <property name="can_focus">False</property>
-		<signal name="player-raised" handler="on_media_player_raised" object="PhoshSettings" swapped="yes"/>
-	      </object>
-	    </child>
+                <signal name="player-raised" handler="on_media_player_raised" object="PhoshSettings" swapped="yes"/>
+              </object>
+            </child>
           </object>
         </child>
       </object>

src/ui/system-prompt.ui

@@ -206,8 +206,8 @@
           <placeholder/>
         </child>
         <style>
-	  <class name="phosh-system-modal-dialog"/>
-	  <class name="phosh-system-prompt"/>
+          <class name="phosh-system-modal-dialog"/>
+          <class name="phosh-system-prompt"/>
         </style>
       </object>
     </child>