Fix missing required argument in ADUserCreds Report constructor

[crypt0lith]

Summary

list_report_options in armory_cmd.py raises TypeError for the ADUserCreds report template due to a missing required argument:

$ armory -r ADUserCreds -R
Traceback (most recent call last):
  ...
  File ".../armory_cmd.py", line 272, in list_report_options
    m = Module.Report()
TypeError: Report.__init__() missing 1 required positional argument: 'db'

Root cause

The Report class in ADUserCreds.py overrode ReportTemplate.__init__ in an incompatible manner. ReportTemplate defined def __init__(self, db=None): pass, while ADUserCreds.Report defined def __init__(self, db): pass, making db a required argument by omitting the default None value.

Fix

Remove the __init__ methods for both ReportTemplate and ADUserCreds.Report, since the db argument was never used and no callers in the package supplied it.

[fang0654]

Oh yeah, this is left over from armory v1. Thanks for the PR!