Fix index error by repeated lambda updates (#45)

Update constraints.py

Reset list of constraint penalty functions to avoid endless additions.

Signed-off-by: Henri Karhula <[email protected]>

Author: henrikarhula

Diff for: src/mqt/qao/constraints.py

@@ -55,6 +55,7 @@ def translate_constraints(self, var: Variables) -> tuple[bool, Variables]:
         bool -- for identifying eventual errors or issue in the conversion
         auxiliary_variables -- variable added for writing constraints
         """
+        self.constraints_penalty_functions = []
         auxiliary_variables = Variables()
         i = 0
         j = 0