Correct IVAS_cod printout help for supported MASA DTX bitrates

• Related issues: #1510 (closed)
• Requested reviewers: @pihlajakuja or anybody else from Nokia

Reason why this change is needed

• Wrong encoder printout wrt. MASA DTX.

Description of the change

• Correct the printout information.
• No compilation flag, as only the printout message is affected.

Affected operating points

• All is BE.

Related to #1510 (closed)