fix the path to the x-wrt feed (svn:// is broken on berlios.de at the moment)

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@11494 3c298f89-4303-0410-b956-a3cf2f4a3e73

feeds.conf

 src-svn packages https://svn.openwrt.org/openwrt/packages
-src-svn xwrt svn://svn.berlios.de/xwrt/trunk/package
+src-svn xwrt http://svn.berlios.de/svnroot/repos/xwrt/trunk/package