Lose characters when fullwidth characters exist and end is not specified

[bet4it]

Lose characters when there are fullwidth characters in the string and the third argument end is not specified:

const str = sliceAnsi("古古test", 0);
// => '古古te'

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[sindresorhus]

I've added a failing test for this: https://github.com/chalk/slice-ansi/commit/108d0ad176da3bb797fb3037e9a838c5c00eba84

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