noImmediatePrefix seems not working for numeral fields

[mbilotta]

It seems to me that the noImmediatePrefix option is not working as intended for numeral fields.

Reproduction

https://jsfiddle.net/r5Lj9tu8/

Expected behaviour

If I just click the numeral field, no prefix should show.

Actual behaviour

Just clicking the numeral field cause the prefix to appear.

My guess is that the problem is here:

https://github.com/nosir/cleave.js/blob/e3fa6f3637fa6d8ea97ef66ac1957950632b72ab/src/Cleave.js#L199

Maybe your intention was to check for !pps.noImmediatePrefix instead. I'm not fully sure anyway.