chore(tests): update karma config file
chore(tests): update karma config file

Similar to PR #334 for wallaby.js, fixes null error during test run.
mbroadst/skeleton-navigation,delebash/skeleton-navigation,niieani/skeleton-navigation-typescript,GMU1/Elite,mbroadst/skeleton-navigation,niieani/skeleton-navigation-typescript,ahmedshuhel/skeleton-navigation,aaronroberson/skeleton-navigation,ahmedshuhel/skeleton-navigation,ahmedshuhel/skeleton-navigation,aaronroberson/skeleton-navigation,niieani/skeleton-navigation-typescript,stephenlautier/skeleton-navigation,stephenlautier/skeleton-navigation,wallabyjs/skeleton-navigation,aaronroberson/skeleton-navigation,GMU1/Elite,ahmedshuhel/skeleton-navigation,wallabyjs/skeleton-navigation,wallabyjs/skeleton-navigation,niieani/skeleton-navigation-typescript,delebash/skeleton-navigation,wallabyjs/skeleton-navigation,aaronroberson/skeleton-navigation