Initial height for chordname entry too low

GIT commit: a2b136c

Steps to reproduce:

1) click any note in Promenade example (or any score created from defaults)
2) Ctrl+K

Expected result: cursor appears above staff
Actual result: cursor appears below staff

Once you've entered the chord. it snaps back up where it belongs.

I'm betting this was introduced by the recent change fix to manual positioning:

https://github.com/musescore/MuseScore/commit/85f9416dee7270676ee6fed29…