Fix: disable the storyview scroll in the "Open" tab

[BurningTreeC]

This PR adds a variable tv-disable-storyview-scroll that, if set, disables the scrolling to the target element.
This is useful in the sidebar's "Open" tab for example, where under certain circumstances it can cause the sidebar to scroll when opening a new tiddler or the control panel

[github-actions]

Confirmed: BurningTreeC has already signed the Contributor License Agreement (see contributing.md)

[BurningTreeC]

to reproduce:

• go to tiddlywiki.com
• change the sidebarlayout to fixed-fluid
• close the ControlPanel
• open the dev tools
• go to the Inspector
• add the attribute dir="rtl" to the html element
• open the "Open" sidebar tab
• open the ControlPanel again or a New Tiddler
• see how the sidebar scrolls

to compare, here's a build with this PR:
https://tv-disable-storyview-scroll.tiddlyhost.com/

[BurningTreeC]

This fixes also the behavior of scrollIntoView in Chromium browsers (should we use scrollIntoView in the future for the pageScroller) - where a scrollIntoView stops the previous scrollIntoView ... so if we scrolled the ControlPanel into view and had the sidebar's "Open" tab open, the story-river wouldn't scroll to the ControlPanel (or just a bit)