`strip_param_segments` regular expression typo

There seems to be a typo in the nextgen-gallery/products/photocrati_nextgen/modules/router/mixin.url_manipulation.php file on line 156.

There’s a missing “P” before “<key>” in the regular expression, which results in a Warning and improper loading of some pages on certain setups.

http://wordpress.org/plugins/nextgen-gallery/