Make sure TrackArtist updates prefs on construction...

... and move one more gPrefs lookup into it.

Don't expect TrackPanel to invoke it always, because sometimes TrackArtist
is standalone, as in Printing.cpp

src/TrackArtist.cpp

@@ -173,6 +173,8 @@ TrackArtist::TrackArtist()
 
    SetColours(0);
    vruler = std::make_unique<Ruler>();
+
+   UpdatePrefs();
 }
 
 TrackArtist::~TrackArtist()
@@ -251,8 +253,6 @@ void TrackArtist::DrawTracks(TrackPanelDrawingContext &context,
       }
    }
 
-   gPrefs->Read(wxT("/GUI/ShowTrackNameInWaveform"), &mbShowTrackNameInWaveform, false);
-
    for(auto leader : tracks->Leaders()) {
       auto group = TrackList::Channels( leader );
       leader = leader->SubstitutePendingChangedTrack().get();
@@ -3172,6 +3172,10 @@ void TrackArtist::UpdatePrefs()
    mdBrange = gPrefs->Read(ENV_DB_KEY, mdBrange);
    mShowClipping = gPrefs->Read(wxT("/GUI/ShowClipping"), mShowClipping);
    mSampleDisplay = TracksPrefs::SampleViewChoice();
+
+   mbShowTrackNameInWaveform =
+      gPrefs->ReadBool(wxT("/GUI/ShowTrackNameInWaveform"), false);
+   
    SetColours(0);
 }