Remove obsolete php-fpm log line.

src/deb/php/php-fpm.conf

@@ -25,7 +25,6 @@ env[HESTIA] = $HESTIA
 env[VESTA] = $HESTIA
 env[LANG] = en_US.UTF-8
 php_flag[display_errors] = off
-php_admin_value[error_log] = /usr/local/hestia/log/fpm-php.log
 php_admin_flag[log_errors] = on
 php_admin_value[memory_limit] = 256M
 php_admin_value[post_max_size] = 512M