Always call Phar::mapPhar() even when no alias has been set

This simple PR makes sure to always include a call to `Phar::mapPhar()`. This call is needed if you rename your resulting phar file and remove its file extension. Removing the file extension is often used when moving *local* phars to systems wide installations, e.g. when renaming `~/demo.phar` to `/usr/bin/demo`.