Issue
Starting version v0.27.9 slickPrev stop working after refresh. targetSlide values becomes -1 instead of previous slide index. See below:
The screenshots demonstrate a change slide action starting from index 3 in both versions.
Not working as of 0.27.9

Working 0.27.8 and below

It looks like there is a bug here, regardless if lazyload is true/false it will also be overwritten when infinite is false

This code was also added when version failed git diff 69348c1 a43f109
