Improve initial and minimum widths of resizable toolbars.

In particular, device toolbar previously could be made ridiculously small.
Also in the default configuration it takes a whole line, so we now use that space in its initial size.

Mixer Toolbar initial size was a little small.  Now it matches the Transport Toolbar width.
Meter Toolbar initial size was too small.
Transcription Toolbar was a little too small.  Better to start out slightly wider than previously.

src/toolbars/ToolBar.cpp

@@ -522,8 +522,8 @@ void ToolBar::ReCreateButtons()
       // Initial size at least as big as minimum.
       if( sz3.y < sz2.y )
          sz3.y = sz2.y;
-      if( sz3.x < sz2.x )
-         sz3.x = GetInitialWidth();
+      //if( sz3.x < sz2.x )
+      sz3.x = GetInitialWidth();
       //sz.SetWidth();
       SetSize(sz3);
    }