fix check

Author: mShan0

mssql/functions.py

@@ -282,9 +282,9 @@ def _get_check_sql(self, model, schema_editor):
     else:
         query = Query(model=model)
     if VERSION >= (5, 1):
-        where = query.build_where(self.check)
-    else:
         where = query.build_where(self.condition)
+    else:
+        where = query.build_where(self.check)
     compiler = query.get_compiler(connection=schema_editor.connection)
     sql, params = where.as_sql(compiler, schema_editor.connection)
     if schema_editor.connection.vendor == 'microsoft':