Remove duplicated functions match_default_fit and match_2dhist_fit in align_utils.py

[stscijgbot-hstdp]

Issue HLA-1188 was created on JIRA by Steve Goldman:

In align_utils.py two functions are identical and one of them can be removed (e.g. match_default_fit). This will require a deprecation warning for a while and a check on whether other functions are affected.