Scrollbar: Win 11 autohide fix

[evinnichenko]

Fixing the problem of scrollbar not showing on Windows 11 if "Always show scrollbars" is turned off.

• Added option to show scrollbar (new behavior) or not (old behavior)
• If selected, will reduce width of .bookmarks, .session-list, .history-list to 100% and show scrollbar on hover
• Fixed a minor issue with "restore (close active/all)" missing icons. If that was only an issue on my end, delete lines session-sync.css@2048-2055

Known issues: it seems that JS scripts don't work in tab and window mode, so scrollbars there are stuck in the original behavior mode.