Remove the noqa and adjust test reference files

[hillairet]

As planned I removed the flake8: noqa from the top of the files that had it.

I was surprised to see that the tests failed till I realized that the change in line number would affect the expected exception strings.
Oh well, a little bit of editing later and it's corrected.
I'd love to know how you make these .txt files with the expected output. I'm happy to document the process too if you want in CONTRIBUTING.
For this time around though the editing may have been more straight forward.

[Delgan]

Apologies, @hillairet, I should have been more proactive and talked to you about this earlier in #955. When modifying the source code for testing exception formatting (or when adding new tests), you can uncomment this line and run the tests to automatically recreate the .txt files:

loguru/tests/test_exceptions_formatting.py

Line 111 in 0f9cdeb

# generate(stderr, outpath)

Sorry you had to update the files manually. 😨

However, I prefer not to mention this in CONTRIBUTING. This file is a fairly high-level description, whereas the generate() function is an implementation detail related to a very specific test. Instead, I'll try to be more responsive next time to guide contributors properly.

I'm merging this PR. Again, thanks a lot for your help! 😃

[hillairet]

Oh one line change? 😅
Well I should have just been more patient and have taken the time to ask you before assuming that it'd be faster to edit. No harm done.