Remove tests that rely on nonexistent bad-option error

[catamorphism]

I suggest we remove these two tests for now, because the property that they are testing is actually underspecified. There is nothing in errors.md corresponding to the bad-option error, and what's more, the spec doesn't require :number to signal an error for a non-integer minimumFractionDigits value.

I filed #738 and #739 to clarify those issues in the spec, but I think the tests should be removed in the meantime, and re-added once the behavior is fully specified.