data: Update 'hide' and 'layout' OSK keys icons

Update these to the current mockups. Since there is now the extended
layout for terminals in the OSK, the downwards looking arrow we used for
the "hide OSK" action is visually too similar to the "cursor down" key
nearby.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/5762
Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/2433>

data/icons/scalable/status/keyboard-hide-symbolic.svg

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data/icons/scalable/status/keyboard-layout-symbolic.svg

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