Work around some functional but nonstandard MMI codes.

http://code.google.com/p/android/issues/detail?id=2226
http://code.google.com/p/cyanogenmod/issues/detail?id=1575

The MMI code "#190*1660#*" is nonstandard, not ending with #.  The "*"
at the end gets parsed as the dialingNumber portion, and processCode
raises an error instead of treating it as a generic MMI code with no
special handling and passing it on verbatim.

Treat the * at the end as part of the # terminator, so it doesn't get
dropped into dialingNumber.

I can't fully test this; I don't know any T-Mobile MMI codes like this
and I'm not going to dial mysterious MMI codes into my phone.  I've tested
that normal MMI codes still work by stopping and restarting call
forwarding to GV on my phone.  Someone affected by this issue needs to
test this.

Updated the "dialing number" comment, which was incorrect.

If this isn't fixed in the 2.2 source drop, this commit can probably be
pushed upstream after confirmation.