template_helpers: Fix get_pagination_variables
template_helpers: Fix get_pagination_variables

The GET parameter is a string and should be converted to int.

Refs SHOOP-1419

jorge-marques/shoop,akx/shoop,shawnadelic/shuup,akx/shoop,suutari-ai/shoop,akx/shoop,hrayr-artunyan/shuup,hrayr-artunyan/shuup,shawnadelic/shuup,shawnadelic/shuup,suutari/shoop,suutari-ai/shoop,jorge-marques/shoop,taedori81/shoop,suutari/shoop,suutari/shoop,jorge-marques/shoop,suutari-ai/shoop,taedori81/shoop,shoopio/shoop,shoopio/shoop,taedori81/shoop,shoopio/shoop,hrayr-artunyan/shuup