Fix size of sidebar trigger and fullscreen icons
Fix size of sidebar trigger and fullscreen icons

The sidebar trigger and fullscreen icons should have the same size as
the app navigation toggle (although the media icons are kept with the
same size as before). Note that this only reduces the visual size; the
touchable size is still 44x44px.

Signed-off-by: Daniel Calviño Sánchez <bd7629e975cc0e00ea7cda4ab6a120f2ee42ac1b@gmail.com>

nextcloud/spreed,nextcloud/spreed,nextcloud/spreed