🐛 [amp-base-carousel] fix for next arrow not hidden properly when visible-count > 1

[chrjs75]

This is a fix for the amp-base-carousel that do not behave properly in hiding the next arrow when reaching the end of the slides.
In particular, the hiding code was not working when there are more than one slide visible in the page (visible-count attribute set greater than 1).

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[chrjs75]

This fix is related to #27817 and #27403.