More room for "Please Wait..." on playback screen

After a recording is selected for playback and before the playback
actually starts the message "Please Wait..." is presented.
In theme MythCenter-wide the width of the message box is just big enough.
Make the box a bit bigger so that also slightly longer texts, such as
the Dutch translation, can be presented here.

mythtv/themes/MythCenter-wide/base.xml

@@ -1167,7 +1167,7 @@
         </shape>
 
         <textarea name="title" from="basetextarea">
-            <area>500,336,280,50</area>
+            <area>400,336,480,50</area>
             <font>baselarge</font>
             <align>allcenter</align>
             <value>Please Wait...</value>