fix sf4 deprecated: remove choices_as_values form option

Form/ActivityType.php

@@ -84,7 +84,6 @@ class ActivityType extends AbstractType
         $durationTimeTransformer = new DateTimeToTimestampTransformer('GMT', 'GMT');
         $durationTimeOptions = array(
                 'choices' => $timeChoices,
-                'choices_as_values' => true,
                 'placeholder' => 'Choose the duration',
         );
 
@@ -100,7 +99,6 @@ class ActivityType extends AbstractType
             ->add('attendee', ChoiceType::class, array(
                'expanded' => true,
                'required' => false,
-               'choices_as_values' => true,
                'choices' => array(
                   'present' => true,
                   'not present' => false

Form/ActivityTypeType.php

@@ -23,7 +23,6 @@ class ActivityTypeType extends AbstractType
                     'Yes' => true,
                     'No'  => false
                 ),
-                'choices_as_values' => true,
                 'expanded' => true
             ));
     }