[ExpandableListItem] use standard button sizes
requested to merge ngraham/plasma-framework:use-standard-button-sizes-in-expandablelistitem into master
The sizes of the context buttons on the list item were being overridden for no clear reason. Let's stop doing that so that the button sizes are consistent with other PC3 button sizes.
Before:
After, with just this patch:
After, with this patch plus https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/20:
So we probably don't want to merge this until after https://invent.kde.org/frameworks/plasma-framework/-/merge_requests/20 has landed.
cc @teams/vdg