Minor fix to test_inspect so that all tests in it pass

It's possible to get both the tuple parameters AND the unpacked
parameters by using locals(). However, they are named differently in
CPython and Jython:

* For CPython, such tuple parameters are named '.1', '.2', etc.
* For Jython, they are actually the formal parameter, eg '(d, (e, f))'

test_inspect actually wants to ignore such tuple parameters when
verifying working with function signatures, given they are already
unpacked. Updated is_tuplename regex accordingly.