Default RollOverDesktops (AKA "navigation wraps around") to false

Having RollOverDesktops false is more intuitive and "natural" for
new users, who may be disoriented by virtual desktop navigation
wrapping around (especially for small numbers of virtual desktops)
and not find the setting to change it very easily.

src/kcmkwin/kwindesktop/virtualdesktopssettings.kcfg

@@ -7,7 +7,7 @@
   <group name="Windows">
     <entry name="rollOverDesktops" key="RollOverDesktops" type="bool">
       <label>Whether or not, we circle through the virtual desktop when moving from one to the next</label>
-      <default>true</default>
+      <default>false</default>
     </entry>
   </group>
   <group name="Plugins">

src/kwin.kcfg

@@ -103,7 +103,7 @@
             <default>true</default>
         </entry>
         <entry name="RollOverDesktops" type="Bool">
-            <default>true</default>
+            <default>false</default>
         </entry>
         <entry name="FocusStealingPreventionLevel" type="Int">
             <default>1</default>