Revert "scroll to end to show next feed or category"

This reverts commit 86f32020f6a06af52eb226bf95c6515cb2537663.
Merge branch 'master' of github.com:gothfox/Tiny-Tiny-RSS
another implementation of pull 386 (show next when finished reading)
another implementation of pull 386 (show next when finished reading) (2)
add a link to headlines-spacer to open next unread feed
minor style tweaks for whiteBox and headlines-spacer
minor style tweaks for whiteBox and headlines-spacer (2)
adjust scroll amount to trigger auto-opening next unread feed