Fixed Case Widget storybook error (#514)

Co-authored-by: Sharma <vishal.sharma@in.pega.com>

Author: vishalshrm539

__mocks__/pcoreMocks.ts

@@ -7,7 +7,7 @@ export default function setPCoreMocks() {
     return {
       getUseLocale: () => 'en-GB',
       getLocale: () => 'en-GB',
-      getTimeZone: () => ''
+      getTimeZone: () => 'America/New_York'
     } as any;
   };