Remove install script

src/freedombone-app-postactiv

     # This improves performance
     sed -i "s|//\$config\['db'\]\['schemacheck'\].*|\$config\['db'\]\['schemacheck'\] = 'script';|g" $postactiv_config_file
 
+    # remove the install script
+    if [ -f /var/www/$POSTACTIV_DOMAIN_NAME/htdocs/install.php ]; then
+        rm /var/www/$POSTACTIV_DOMAIN_NAME/htdocs/install.php
+    fi
+
     systemctl restart php5-fpm
     systemctl restart nginx