Settings.ui: Fix GtkEntry property to make the shortcut editable.

Author: franglais125

Settings.ui

@@ -2849,7 +2849,7 @@ See the <a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0.html">G
                     <property name="column_spacing">32</property>
                     <child>
                       <object class="GtkEntry" id="shortcut_entry">
-                        <property name="can_focus">False</property>
+                        <property name="can_focus">True</property>
                         <property name="valign">center</property>
                         <property name="width_chars">12</property>
                       </object>