dim and dim7 chords don't work (o and o7 do...)

[cleary]

ref https://technimo.helpshift.com/hc/en/3-ireal-pro/faq/88-chord-symbols-used-in-ireal-pro/

all of these chords should play, dim and dim7 don't

$:chord("<Co Cdim Fo7 Fdim7>").s("piano").voicing().dict("ireal-ext")

I've had a bit of a look through the code, but without updating the dictionary itself with a duplicate diminshed entry I'm not sure how to map/add aliases