Revert "Restored reject() call with ui"

This reverts commit 7119c9e5b7.

ui/bootfromdevice.ui

@@ -131,22 +131,5 @@
   </layout>
  </widget>
  <resources/>
- <connections>
-  <connection>
-   <sender>buttonBox</sender>
-   <signal>rejected()</signal>
-   <receiver>BootDialog</receiver>
-   <slot>reject()</slot>
-   <hints>
-    <hint type="sourcelabel">
-     <x>304</x>
-     <y>146</y>
-    </hint>
-    <hint type="destinationlabel">
-     <x>304</x>
-     <y>84</y>
-    </hint>
-   </hints>
-  </connection>
- </connections>
+ <connections/>
 </ui>