fix smart backspace when shuffle
Requirements
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[X] Have you viewed your changes locally on the demos page, located on https://github.com/mattboldt/typed.js/blob/master/index.html?
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[ ] If necessary, have you added a new demo to the index.html list of demos? If it's an improvement or small addition, have you added it to an existing demo on the demos page?
No need for a new demo.
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[X] If applicable, have you created a fork of the following JSFiddle with your branch's code and your new feature showcased?
JSFiddle: https://jsfiddle.net/o5nL0fdp/
Description of the Change
When both Shuffle and Smart Backspace are on, there was a bug when the program computes the next string in order to decide what parts the current and next have in common.
This PR fixes the way the programs uses the pre-shuffled sequence to pull the next string for smart backspace computation.
Benefits
Bugfix!
Issues
#600