Shift + Space for fingering broken by another fix

OS: Windows 10 (10.0), Arch.: x86_64, MuseScore version (64-bit): 3.1.0.5429, revision: 3337e52

1) Load this file: Broken Shift space.mscz
2) Double-click "a" and continue to input a few fingerings, navigating with Spacebar.
3) At a moment: Press Shift + Space to go back
(you made a mistake let's say)

Result: failure. Navigation sticked on place :(

• After checking, this is a consequence of this commit/nightly there is four days: d729a7a
  Indeed, the previous nightly works as expected: 224ba50

To fix: #283316: Hang on pressing space after entering fingering on only note of score