corrige la lógica de bloqueo del modelo en SAP2000

Comb_acciones.py

@@ -191,7 +191,7 @@ try:
     helper = helper.QueryInterface(comtypes.gen.SAP2000v1.cHelper)
     mySapObject = helper.GetObject("CSI.SAP2000.API.SapObject")
     SapModel = mySapObject.SapModel
-    if not SapModel.GetModelisLocked(): SapModel.SetModelisLocked(False)
+    if SapModel.GetModelisLocked(): SapModel.SetModelisLocked(False)
 
 except TimeoutException as exc:
     messagebox.showerror(