Rework scroll method

[anastasiyaig]

Scroll method can lead to infinite loop

https://ci.status.im/job/status-desktop/job/e2e/job/prs/1983/allure/#testresult/23f01f6862da577

We need to rework this somehow so this is not happening anymore

We have 2 scroll methods and they both work weird

self._scroll.vertical_down_to
self._scroll.vertical_scroll_to

[anastasiyaig]

talked to @caybro and there is a suggestion to use this within StatusScrollView:

    function scrollHome() {
        flickable.contentY = 0
    }

    function scrollEnd() {
        flickable.contentY = flickable.contentHeight - flickable.height
    }

    function scrollPageUp() {
        root.ScrollBar.vertical.decrease()
    }

    function scrollPageDown() {
        root.ScrollBar.vertical.increase()
    }