fix url in .vimrc-server

.vimrc-server

@@ -1,5 +1,5 @@
 " Customized .vimrc for server
-" https://gogs.viktorsvensson.se/viktor/public/src/master/.vimrc-server
+" https://gogs.viktorsvensson.se/viktor/public/raw/master/.vimrc-server
 
 " Install curl if missing
 if !executable("curl")