Revert "urxvt: use chromium as the default browser"

This reverts commit 55d5bd20328f3e399aefda6ed8795d272694e77c.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Merge branch 'master' into flamenco

Signed-off-by: Emilio G. Cota <cota@braap.org>