Fix 2.1.4 regression with initialValues updating

[jamesmosier]

This PR remove code introduced in #2205 as described in this issue #2292

To reiterate, as of v2.1.4, initialValues cannot be counted on to not change during the duration of a page load. This code which was introduced in v2.1.4, updates initialValues anytime the initialValues passed into <Formik> changes. Therefore if I have an application and the initialValues I pass in happen to change then Formik will update that in its internal state and therefore when doing things like determining if a form is dirty it can report unexpected results.

This by proxy would then force #2034 to be investigated/fixed again.

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[sPaCeMoNk3yIam]

Need this fix, right now (in 2.1.4) resetForm is not working as expected and forces me to stay on 2.1.3.

[jaredpalmer]

@jamesmosier @sPaCeMoNk3yIam agree. good looks and thanks for this

[cspicuzza]

Thanks for tackling this issue. How soon will it be released?

[lnmp4000]

I've just spent ages debugging this issue with resetForm in my application. I was just about to raise the issue, so glad this is fixed.