misc: revert how the group stats are updated

- so move it back into the `MoveSeries` method, but make it optional,
  then disable it for when we're creating/modifying the group in the v3
  path, since we're updating the stats for the group at the end, after
  all the series have been moved into the group.

Shoko.Server/API/v1/Implementations/ShokoServiceImplementation/ShokoServiceImplementation_Entities.cs

@@ -2200,8 +2200,6 @@ public CL_Response<CL_AnimeSeries_User> MoveSeries(int animeSeriesID, int newAni
 
             ser.MoveSeries(grp);
 
-            grp.TopLevelAnimeGroup?.UpdateStatsFromTopLevel(true, true);
-
             var anime = RepoFactory.AniDB_Anime.GetByAnimeID(ser.AniDB_ID);
             if (anime == null)
             {

Shoko.Server/API/v3/Controllers/SeriesController.cs

@@ -1448,8 +1448,6 @@ public ActionResult MoveSeries([FromRoute] int seriesID, [FromRoute] int groupID
 
         series.MoveSeries(group);
 
-        group.TopLevelAnimeGroup?.UpdateStatsFromTopLevel(true, true);
-
         return Ok();
     }
 

Shoko.Server/API/v3/Models/Shoko/Group.cs

@@ -376,7 +376,7 @@ public CreateOrUpdateGroupBody(SVR_AnimeGroup group)
 
                 // Move the series over to the new group.
                 foreach (var series in seriesList)
-                    series.MoveSeries(group);
+                    series.MoveSeries(group, updateGroupStats: false);
 
                 // Set the main series and maybe update the group
                 // name/description.

Shoko.Server/Models/SVR_AnimeSeries.cs

@@ -1537,7 +1537,7 @@ public bool Hidden
         }
     }
 
-    public void MoveSeries(SVR_AnimeGroup newGroup)
+    public void MoveSeries(SVR_AnimeGroup newGroup, bool updateGroupStats = true)
     {
         // Skip moving series if it's already part of the group.
         if (AnimeGroupID == newGroup.AnimeGroupID)
@@ -1548,6 +1548,8 @@ public void MoveSeries(SVR_AnimeGroup newGroup)
         AnimeGroupID = newGroup.AnimeGroupID;
         DateTimeUpdated = DateTime.Now;
         UpdateStats(true, true);
+        if (updateGroupStats)
+            newGroup.TopLevelAnimeGroup?.UpdateStatsFromTopLevel(true, true);
 
         var oldGroup = RepoFactory.AnimeGroup.GetByID(oldGroupID);
         if (oldGroup != null)