Fix traceback when setting prototype parent

[chiizujin]

Brief overview of PR changes/additions

When setting a prototype parent in the prototype wizard, an exception is raised in the console. No feedback is given in the wizard itself other than [No prototype_parent set] being displayed for the current parent.

This fixes the exception, allowing the parent to be set: Selected prototype parent test.

Motivation for adding to Evennia

Bug fix.

Other info

Exception:

Traceback (most recent call last):
  File "/home/chiizujin/Data/Source/Python/Evennia-contrib/evennia/evennia/commands/cmdhandler.py", line 754, in cmdhandler
    raise ExecSystemCommand(syscmd, sysarg)
evennia.commands.cmdhandler.ExecSystemCommand: (<evennia.utils.evmenu.CmdEvMenuNode object at 0x7f8a2cc99a50>, '1')
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  File "/home/chiizujin/Data/Source/Python/Evennia-contrib/evennia/evennia/utils/evmenu.py", line 1359, in _select_parser
     return select(caller, selection, **kwargs)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 TypeError: _prototype_parent_select() got an unexpected keyword argument '_current_nodename'
 Error in EvMenu.list_node decorator:
   select-callable: <function _prototype_parent_select at 0x7f8a2cefa660>
   with args: (Chiizujintest, ['test'], {'_current_nodename': 'node_prototype_parent'}) raised exception.