Fix plymouth theme modification for Ubuntu 19.10

scripts/paint-it-black.sh

@@ -34,7 +34,7 @@ sedfilter \
 	's/background_color [0-9]+,[0-9]+,[0-9]+/background_color 0,0,0/'
 sedfilter \
 	"$THEMEDIR/ubuntu-logo/ubuntu-logo.script" \
-	's/^(Window.SetBackground(Top|Bottom)Color ?)\(0\.[0-9]{1,2}, 0\.[0-9]{1,2}, 0\.[0-9]{1,2}\)/\1(0.00, 0.00, 0.00)/'
+	's/^(Window.SetBackground(Top|Bottom)Color ?)\(0\.[0-9]{1,5}, 0\.[0-9]{1,5}, 0\.[0-9]{1,5}\)/\1(0.00, 0.00, 0.00)/'
 sedfilter \
 	"$THEMEDIR/ubuntu-text/ubuntu-text.plymouth" \
 	's/^black=0x[a-fA-F0-9]{6}/black=0x000000/'