small fix, should be TC_PRE_SOURCE in get_pre_techniques

Author: rubinatorz

attackcti/attack_api.py

@@ -546,7 +546,7 @@ def get_pre_techniques(self, skip_revoked_deprecated=True, include_subtechniques
         if include_subtechniques:
             pre_techniques = self.TC_PRE_SOURCE.query(Filter("type", "=", "attack-pattern"))
         else:
-            pre_techniques = self.TC_ENTERPRISE_SOURCE.query([
+            pre_techniques = self.TC_PRE_SOURCE.query([
                 Filter("type", "=", "attack-pattern"),
                 Filter('x_mitre_is_subtechnique', '=', False)
             ])