Remove the fullscreen hotkey message

No longer needed after the hotkeys to enter and exit full screen
mode were merged into one

src/qt/qt_progsettings.ui

@@ -165,13 +165,6 @@
      </property>
     </widget>
    </item>
-   <item row="11" column="0">
-    <widget class="QCheckBox" name="checkBoxFullscreenFirst">
-     <property name="text">
-      <string>Display hotkey message when entering full-screen mode</string>
-     </property>
-    </widget>
-   </item>
   </layout>
  </widget>
  <resources/>