fix rewrite base detection for root of alias

Author: Tobion

web/.htaccess

@@ -15,7 +15,7 @@ DirectoryIndex app.php
     # work in environments without path prefix as well, providing a safe, one-size
     # fits all solution. But as you do not need it in this case, you can comment
     # the following 2 lines to eliminate the overhead.
-    RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.+)::\2$
+    RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
     RewriteRule ^(.*) - [E=BASE:%1]
 
     # Redirect to URI without front controller to prevent duplicate content