Fix #25983 - Crash when copy-paste to TAB includes accidentals

The bug has been unveiled by this commit:
https://github.com/musescore/MuseScore/commit/cbb388264af3ed1507b872cf7939a0611d36b5d0
but it probably preexisted.

It is caused in function `Score::pasteStaff()` where the election status after the paste is updated before the re-layout and re-format process is completed (with a call to `updateNotes()`).

Among other things, laying out a TAB involves removing accidentals (which have no room in a TAB) and this leaves the selection with inconsistent contents.

Fixed by moving the selection update step at the end of the `Score::pasteStaff()` function, after the call to `updateNotes()`.
Merge pull request #967 from mgavioli/Fix_25983_Crash_copying_accid_to_TAB

Fix #25983 - Crash when copy-paste to TAB includes accidentals