mouse: Remove italics from test page

https://bugzilla.gnome.org/show_bug.cgi?id=682397

NEWS

@@ -34,6 +34,7 @@ User Accounts:
 Online Accounts:
 - Allow opening a particular account from the command-line
 - Avoid spurious "No online accounts configured" overlay
+- Fix crash when loading the panel a second time
 
 Network:
 - Improve the Wi-Fi page layout

panels/mouse/gnome-mouse-test.ui

@@ -21,9 +21,6 @@
             <property name="xalign">0</property>
             <property name="label" translatable="yes">To test your settings, try to double-click on the face.</property>
             <property name="wrap">True</property>
-            <attributes>
-              <attribute name="style" value="italic"/>
-            </attributes>
           </object>
           <packing>
             <property name="left_attach">0</property>