common: Move flatpak-portal-error.[ch] back to common code

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A symbol from this (flatpak_portal_error_quark) was leaked to libflatpak
due to being marked FLATPAK_EXTERN, so to keep ABI we move it back.

Fixes https://github.com/flatpak/flatpak/issues/1613

Closes: #1616
Approved by: alexlarsson

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