typo in spacing_Functions.py

Please provide the following

• Machine and OS: Linux Ubuntu 22
• binary_c: branch: commit:4fa692b95
• binary_c-python: branch: commit:** 9b8d2949**

    if kwargs.get("showlist", True):
        self.vb_debug(
            "const_dt mass list ({} masses)\n".format(len(mass_list)),
            mass_list
        )

should read

    if kwargs.get("showlist", True):
        self.vb_debug(
            "const_dt mass list ({} masses)\n".format(len(mass_list))
        )