coretext: don't insert item in the hash if it originated from the hash
coretext: don't insert item in the hash if it originated from the hash

Oversight in my fallback fix, this resulted in things being wrongly
destroyed due to unrefs. Oops.

kari-lentz/alpha-pango,kari-lentz/alpha-pango,Distrotech/pango,Distrotech/pango,danny-ku/pango,Distrotech/pango,kari-lentz/alpha-pango,danny-ku/pango,danny-ku/pango,kari-lentz/alpha-pango