BaseTools: Add MaxSizeUserSet to Pcd deepcopy function

MaxSizeUserSet is missing in Pcd deepcopy function.
This patch is to add it back to Pcd deepcopy function.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/Workspace/BuildClassObject.py

@@ -222,6 +222,7 @@ class PcdClassObject(object):
         new_pcd.DefaultValue = self.DefaultValue
         new_pcd.TokenValue = self.TokenValue
         new_pcd.MaxDatumSize = self.MaxDatumSize
+        new_pcd.MaxSizeUserSet = self.MaxSizeUserSet
 
         new_pcd.Phase = self.Phase
         new_pcd.Pending = self.Pending