Revert "[Domains] issuu.com: disable tests with oembed error 403 (#639)"

This reverts commit 28f9101.

Author: siniakinaa

plugins/domains/issuu.com.js

@@ -35,12 +35,10 @@ export default {
     },
 
     tests: [
-        /*
         "https://issuu.com/redbulletin.com/docs/the_red_bulletin_stratos_special_us",
         "https://issuu.com/_dca/docs/edicio_n_diario_de_centro_ame_rica_02_de_junio_de_20",
         "https://issuu.com/visitfaroeislands/docs/tg25-uk-web_compressed",
         "https://issuu.com/cbmicheals/docs/wwii_hero_franklin_micheals",
         "https://issuu.com/photoedmagazine/docs/photoed-w24_colour_for_issuu_print_replica"
-        */
     ]
 };