Call ModifyState(false) after changing zoom

This doesn't need to trigger an autosave (which is what passing true would do), but the state should still be modified.

Unfortunately this doesn't seem to enable saving -- probably because no undo state is being pushed.  That's something to consider for the future.

src/tracks/playabletrack/notetrack/ui/NoteTrackControls.cpp

@@ -116,7 +116,7 @@ void NoteTrackMenuTable::OnChangeOctave(wxCommandEvent &event)
    pTrack->ShiftNoteRange((bDown) ? -12 : 12);
 
    AudacityProject *const project = ::GetActiveProject();
-   project->ModifyState(true);
+   project->ModifyState(false);
    mpData->result = RefreshCode::RefreshAll;
 }
 

src/tracks/playabletrack/notetrack/ui/NoteTrackVRulerControls.cpp

@@ -81,7 +81,7 @@ unsigned NoteTrackVRulerControls::HandleWheelRotation
       return RefreshNone;
    }
 
-   pProject->ModifyState(true);
+   pProject->ModifyState(false);
 
    return RefreshCell | UpdateVRuler;
 }

src/tracks/playabletrack/notetrack/ui/NoteTrackVZoomHandle.cpp

@@ -221,6 +221,7 @@ void NoteTrackVRulerMenuTable::OnZoom( int iZoomCode ){
       break;
 
    }
+   GetActiveProject()->ModifyState(false);
 }
 
 
@@ -307,7 +308,7 @@ UIHandle::Result NoteTrackVZoomHandle::Release
    }
 
    mZoomEnd = mZoomStart = 0;
-   pProject->ModifyState(true);
+   pProject->ModifyState(false);
 
    return RefreshAll;
 }