translate: Fix transcoding while different in frame size.

translate: Fix transcoding while different in frame size.

When Asterisk translates between codecs each with a different frame size (for
example between iLBC 30 and Speex-WB), too large frames were created by
ast_trans_frameout. Now, ast_trans_frameout is called with the correct frame
length, creating several frames when necessary. Affects all transcoding modules
which used ast_trans_frameout: GSM, iLBC, LPC10, and Speex.

ASTERISK-25353 #close

Change-Id: I84b59f7a745955820f10e20f5999eb69495a68b9