Don't set m_IsPreviewer to force 3D models.

It has unintended side-effects (such as showing
user drawings and user comments layers).

Fixes https://gitlab.com/kicad/code/kicad/-/issues/21428

(cherry picked from commit b2ecaf1ddc)

pcbnew/pcbnew_jobs_handler.cpp

@@ -577,9 +577,6 @@ int PCBNEW_JOBS_HANDLER::JobExportRender( JOB* aJob )
     boardAdapter.SetBoard( brd );
     boardAdapter.m_IsBoardView = false;
 
-    if( aRenderJob->m_appearancePreset.empty() )
-        boardAdapter.m_IsPreviewer = true; // Force display 3D models, regardless of 3D viewer options
-
     SETTINGS_MANAGER&      mgr = Pgm().GetSettingsManager();
     EDA_3D_VIEWER_SETTINGS cfg;
 
@@ -590,6 +587,16 @@ int PCBNEW_JOBS_HANDLER::JobExportRender( JOB* aJob )
         cfg.m_LayerPresets = userCfg->m_LayerPresets;
     }
 
+    if( aRenderJob->m_appearancePreset.empty() )
+    {
+        // Force display 3D models
+        cfg.m_Render.show_footprints_not_in_posfile = true;
+        cfg.m_Render.show_footprints_dnp = true;
+        cfg.m_Render.show_footprints_insert = true;
+        cfg.m_Render.show_footprints_normal = true;
+        cfg.m_Render.show_footprints_virtual = true;
+    }
+
     if( aRenderJob->m_quality == JOB_PCB_RENDER::QUALITY::BASIC )
     {
         // Silkscreen is pixelated without antialiasing