api: Cut ChannelPropertyName.canRemoveSubscribersGroup

This is affected by the same root cause as #1082, though the impact
here is much smaller: this one only applies to an event at the moment
someone edits one of these settings.

Author: gnprice

lib/api/model/events.dart

@@ -439,9 +439,6 @@ class ChannelUpdateEvent extends ChannelEvent {
         return value as int?;
       case ChannelPropertyName.channelPostPolicy:
         return ChannelPostPolicy.fromApiValue(value as int);
-      case ChannelPropertyName.canRemoveSubscribersGroup:
-      case ChannelPropertyName.canRemoveSubscribersGroupId:
-        return value as int;
       case ChannelPropertyName.streamWeeklyTraffic:
         return value as int?;
       case null:

lib/api/model/events.g.dart

@@ -388,8 +388,8 @@ enum ChannelPropertyName {
   messageRetentionDays,
   @JsonValue('stream_post_policy')
   channelPostPolicy,
-  canRemoveSubscribersGroup,
-  canRemoveSubscribersGroupId, // TODO(server-8): remove, replaced by canRemoveSubscribersGroup
+  // canRemoveSubscribersGroup, // TODO(#814)
+  // canRemoveSubscribersGroupId, // TODO(#814) handle // TODO(server-8) remove
   streamWeeklyTraffic;
 
   /// Get a [ChannelPropertyName] from a raw, snake-case string we recognize, else null.

lib/api/model/model.dart

@@ -279,9 +279,6 @@ class ChannelStoreImpl with ChannelStore {
             stream.messageRetentionDays = event.value as int?;
           case ChannelPropertyName.channelPostPolicy:
             stream.channelPostPolicy = event.value as ChannelPostPolicy;
-          case ChannelPropertyName.canRemoveSubscribersGroup:
-          case ChannelPropertyName.canRemoveSubscribersGroupId:
-            break; // not tracking this property
           case ChannelPropertyName.streamWeeklyTraffic:
             stream.streamWeeklyTraffic = event.value as int?;
         }

lib/api/model/model.g.dart

@@ -786,8 +786,6 @@ ChannelUpdateEvent channelUpdateEvent(
       assert(value is int?);
     case ChannelPropertyName.channelPostPolicy:
       assert(value is ChannelPostPolicy);
-    case ChannelPropertyName.canRemoveSubscribersGroup:
-    case ChannelPropertyName.canRemoveSubscribersGroupId:
     case ChannelPropertyName.streamWeeklyTraffic:
       assert(value is int?);
   }