Change maxHelpers default for simple-unless rule?

[bmish]

I was never too big of a fan of how this simple-unless rules disallows helpers with unless entirely. In many of my codebases at work, we have disabled the helpers check with 'simple-unless': { maxHelpers: -1 }. Might be worth re-evaluating the default for this in a major release (v5 #2319). Even allowing just 1 helper by default would help a lot.

This is especially relevant now that we added an autofixer for this in #2639. Autofixing unless to if not just because a helper is present doesn't feel like much of an improvement and is kind of annoying.

Originally posted by @bmish in #2639 (comment)