Core/Map: Load the grid of TempSummons owned by Players

Ensure to load the grid of TempSummons owned by Players when the relocate to another cell

src/server/game/Maps/Map.cpp

@@ -1468,6 +1468,9 @@ bool Map::CreatureCellRelocation(Creature* c, Cell new_cell)
         return true;
     }
 
+    if (c->GetCharmerOrOwnerGUID().IsPlayer())
+        EnsureGridLoaded(new_cell);
+
     // in diff. loaded grid normal creature
     if (IsGridLoaded(GridCoord(new_cell.GridX(), new_cell.GridY())))
     {