Fixed previous commit. The messages was being shown with a "(still]"

instead of "(still??)".

Signed-off-by: Michele Calgaro <michele.calgaro@yahoo.it>
(cherry picked from commit 9230b9036f)

client/config/configdialog.ui

@@ -1795,7 +1795,7 @@
                             <bool>true</bool>
                         </property>
                         <property name="toolTip" stdset="0">
-                            <string>When this is turned on, you may (still??) experience high CPU usage. Use it carefully!</string>
+                            <string>When this is turned on, you may (still?) experience high CPU usage. Use it carefully!</string>
                         </property>
                     </widget>
                 </grid>