[Trunk] Selecting common time or alla breve symbol during score creation shouldn't change numeral time signature

1. 'New...'.
2. Click 'Continue' until 'Create Time Signature' step.
3. Enter 12/8 time signature.
4. Click either common time or alla breve symbol.

Desired result: The numeric time signature remains (12/8).
Actual result: The time signature changes to 4/4 (if selecting common time), or 2/2 (or selecting alla breve).

Discussion: You may wish to change it back. This issue could be debated, however.

Using MuseScore 2.0 Nightly Build (5091) - Mac 10.6.8.