Slightly increase default non-touch-mode delegate paddings
Part of teams/vdg/issues#37.
This has a couple of advantages:
- Larger click targets; faster interaction
- Easier usability when using a touchscreen or 2-in-1 laptop not in the explicit touch mode
- Looks a bit better; items feel less crammed
- Helps us toward the goal of porting things away from RoundedItemDelegate, which increases consistency everywhere
The downside is slightly decreased information density for very long lists. But I think that's an acceptable trade-off.
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