ApplicationsListPage: fix unnecessary horizontal scrolling
The content comes from a Kirigami.CardsListView, which brings its own horizontal margins that interfere with default paddings from DiscoverPage and cause the page to be slightly horizontally scrollable.
We need to make sure that there are no overlapping margins, which can be done by setting the CardsListView to the page's flickable property and nulling out its top and bottom padding values. UX remains the same other than the bug being fixed.
To verify, click "All Applications" and then press the right arrow key.
BUG: 477493 FIXED-IN: 6.3.0