[orca-list] bug orca master with combobox

[Jérémy Prego <jeremy pregonetwork net>]

hello,

since a few days, I found that he has a problem with orca master and
the  combobox. Orca does not say the value when it arrives on the
combobox with the tab key.

step to reproduce:
1. open for example Thunderbird
2. ctrl + maj + f for open search mail
3. using the tab key, reach up to the combobox.
Result:
orca say combobox 1 of 1.
Expected result:
orca should say the value of the combobox directly and 1 of x

Thanks for the fix !

Jerem