Test suites shouldn't fiddle with unfolding threshold

[arybczak]

Since test suites bump unfolding threshold to 150, I find they don't reflect the environment people write code in.

As an example, when I run into the problem from #112 while fiddling with test suite of optics and wanted to include this in the test suite of generic-optics, it turned out that everything inlines just fine within Spec.hs module because of increased unfolding threshold.

If increased threshold is absolutely needed for comparison of the definition of lenses, I suggest going another route: don't compare definitions, compare usage sites of definitions (i.e. don't test core of lenses themselves, test core of applying them to view/set/over etc.

optics has https://github.com/well-typed/optics/blob/0dea927/optics/tests/Optics/Tests/Labels.hs and when I replaced TH optics with generic optics everything passes with #112 and default compiler options, so I consider it a reasonable approach.