controls/SwipeListItem: fix action positions in RtL

Christoph Wolkrequested to merge
cwo/kirigami:fix_sli_actions_rtl into master

OverlayLoader sets LayoutMirroring.enabled to false, so the anchors don't work out and it anchors the actions to the start of the delegate in RtL, overlapping the text.

Instead, set different anchors it RtL.

before after
sli_rtl_before sli_rtl_after

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