Honour renderSettings' default font.

This still leaves a few things out in the cold,
such as hit-testing and polygon generation.
But at least it allows us to plot with a default
font.

Fixes https://gitlab.com/kicad/code/kicad/-/issues/19031

common/plotters/PDF_plotter.cpp

@@ -1729,9 +1729,8 @@ void PDF_PLOTTER::Text( const VECTOR2I&        aPos,
 
     wxStringTokenizer str_tok( aText, " ", wxTOKEN_RET_DELIMS );
 
-    // If aFont is not specilied (== nullptr), use the default kicad stroke font
     if( !aFont )
-        aFont = KIFONT::FONT::GetFont();
+        aFont = KIFONT::FONT::GetFont( m_renderSettings->GetDefaultFont() );
 
     VECTOR2I full_box( aFont->StringBoundaryLimits( aText, t_size, aWidth, aBold, aItalic,
                                                     aFontMetrics ) );