php: fpm: remove sample status page

php-fpm installs a sample status page to $datadir/fpm/status.html
It is not of any use in that directory, so remove it from target.
If someone wants to use it, he can copy it to webroot manually.

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>