lorax: drop plymouth label plugin

It's not used by installer theme but pulls a lot of libraries into initrd.

lorax-templates-qubes/templates/runtime-cleanup.tmpl

@@ -94,6 +94,9 @@ remove lib/modules/*/{build,source,*.map}
 
 ## this prevents network support from being included in initrd
 remove etc/sysconfig/network-scripts
+## do not include plymouth 'label' plugin (no text used in installer theme)
+remove etc/dracut.conf.d/plymouth-missing-fonts.conf
+remove etc/fonts/conf.d/57-dejavu-sans.conf
 
 ## remove unused themes, theme engines, icons, etc.
 removefrom gtk2 /usr/${libdir}/gtk-2.0/*/{engines,printbackends}/*