Do not consider issue text in `__eq__` method

[e0ne]

Issue text is not supposed to be consistent between banndit versions. It was changed few times in the past. That's why we don't need to match text too between issues.

This issue is only valid if we compare old bandit baseline generated with the old version with a new one generated using the last bandit.

[ericwb]

@e0ne Can you please open a bug on this issue and include how to recreate? Thanks