Fix check for image type files for thumbnailing
Fix check for image type files for thumbnailing

Refs SHOOP-1089

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