Removes `defaultRowHeight` prop added in adb8aa39f in favor of a prop
that disables font size scaling. A non-default row height can still be
specified with `rowHeight`.
Most of our existing trees need to disable font size scaling, but the
idea is that pretty much everything _should_ scale with font size for
accessibility, and it's a limitation of the current prefs and other UIs
that they don't currently, so it's better to default to scaling and
gradually remove uses of this prop.
This fixes a bug where the HTML trees other than the collection and item
trees would have larger rows but without larger text when font size was
increased.
Also:
- Fixes#2157 by fixing line height adjustment on macOS when at the
default font size, applying it to all trees, and moving the explicit
`rowHeight` override from the item tree to the collection tree, which
should have more spacing than all other trees (rather than the item tree
having less).
d0635e12cb
