upgrade shell config file

sys/extensions/4.user.lua

@@ -14,11 +14,18 @@ end
 
 local lua_path = package.path
 
+-- TODO: Temporary
+local upgrade = Util.readTable('usr/config/shell')
+if upgrade and not upgrade.upgraded then
+	fs.delete('usr/config/shell')
+end
+
 if not fs.exists('usr/config/shell') then
 	Util.writeTable('usr/config/shell', {
 		aliases  = shell.aliases(),
 		path     = 'usr/apps',
 		lua_path = lua_path,
+		upgraded = true,
 	})
 end