chore(multiple_choice_view): remove padding from ListView (#1484)

Author: Sembauke

mobile-app/lib/ui/views/learn/challenge/templates/multiple_choice/multiple_choice_view.dart

@@ -92,7 +92,6 @@ class MultipleChoiceView extends StatelessWidget {
             ),
             body: SafeArea(
               child: ListView(
-                padding: const EdgeInsets.all(12),
                 children: [
                   if (challenge.videoId != null) ...[
                     ChallengeCard(