Improve control issues on the detail screen

Set the exit button as the default control as the list may not be ready
for focus when the screen first loads.

Provide control navigation between the torrent file list and the exit
button.

resources/skins/Default/720p/script-Transmission-details.xml

@@ -1,5 +1,5 @@
 <window>
-	<defaultcontrol>220</defaultcontrol>
+	<defaultcontrol>111</defaultcontrol>
 	<allowoverlay>yes</allowoverlay>
 	<coordinates>
 		<system>1</system>
@@ -81,6 +81,7 @@
 			<posy>185</posy>
 			<width>950</width>
 			<height>330</height>
+                        <onup>111</onup>
 			<viewtype label="File List">list</viewtype>
 			<orientation>vertical</orientation>
 			<visible>true</visible>
@@ -146,6 +147,7 @@
 			<posy>0</posy>
 			<width>64</width>
 			<height>32</height>
+                        <ondown>220</ondown>
 			<label>-</label>
 			<font>-</font>
 			<onclick>PreviousMenu</onclick>