[KCM] Squeeze key and make it selectable by mouse

Avoids it blowing up the layout

kcm/kcm.ui

@@ -215,10 +215,13 @@
                </widget>
               </item>
               <item>
-               <widget class="QLabel" name="verificationKey">
+               <widget class="KSqueezedTextLabel" name="verificationKey">
                 <property name="text">
                  <string>🔑 abababab</string>
                 </property>
+                <property name="textInteractionFlags">
+                 <set>Qt::LinksAccessibleByMouse|Qt::TextSelectableByMouse</set>
+                </property>
                </widget>
               </item>
              </layout>
@@ -385,6 +388,11 @@
    <header>kmessagewidget.h</header>
    <container>1</container>
   </customwidget>
+  <customwidget>
+   <class>KSqueezedTextLabel</class>
+   <extends>QLabel</extends>
+   <header>ksqueezedtextlabel.h</header>
+  </customwidget>
  </customwidgets>
  <resources/>
  <connections/>