Fix #25499 : Frets >= 10 in tabs with linked staves.

When entering frets >= 10 in tabs with linked staves, the notes in linked staves are wrong (and debug builds do assert!).

Once added the 2nd digit, the tpc's of the resulting note were not set. Fixed by computing the tpc's of the resulting note.

Raised in forum post: http://musescore.org/fr/node/25499