change mass_update default to False in anchor.getCost

Author: erickaloz

famodel/anchors/anchor.py

@@ -1259,7 +1259,7 @@ def getSafetyFactor(self):
 
             return {'SF_combined': SF} 
 
-    def getCost(self, ms=None, mass_update=True):
+    def getCost(self, ms=None, mass_update=False):
         '''
         Assign material cost using a Point object and getCost_and_MBL().