Fix designerMetadataFieldset flexbox order so metadata appears after layers, not at top

src/index.html

@@ -310,6 +310,7 @@
     #discArtworkFieldset { order: 30; }
     #designerFieldset { order: 15; }
     #layersFieldset { order: 40; }
+    #designerMetadataFieldset { order: 45; }
     #exportFieldset { order: 50; }
     #metadataFieldset { order: 60; }
     #communityFieldset { order: 70; }