applets/digital-clock: Fix sizing and layouts of CalendarView full representation
It makes sizes and paddings more consistent, and fixes RTL issues such as manually mirroring left/right padding properties. Top level layout is now simpler thanks to the anchors. But width still has to be manually set to round(parent.width/2) to keep it pixel-perfect because anchors don't care and binding to e.g. horizontalCenter would result in fractional positioning without any easy way to snap it back. Top-level custom property "paddings" was increased from 1 smallSpacing to 2 of them, since that's what really consistent with the calendar view on the other side, and it looks better for border-touching items anyway. (cherry picked from commit e3311468)