1.1.1: breaks official documentation recommend input -> button DOM element conversion

[lkraav]

It turns out if following https://docs.gravityforms.com/gform_submit_button/#1-change-input-to-button- this will change single-quotes to double-quotes around id="gform_submit_button_1" and str_replace() fails to match.

Duplicate str_replace() doesn't sound like the right thing to do, but perhaps preg_match()?

Although frankly, duplicate str_replace() for quote variants is easy and simple. Maybe worth it. EDIT especially since I now notice gf_submitting_ string is already forced to do the same thing :)