Added fonts suporting new xscreensaver dialoguebox and added lubuntu-grub-theme.

Summary: Added xfonts-efont-unicode which is needed for new xscreensaver dialogue box and lubuntu-grub-theme so that it gets installed by default.

Test Plan:
Check that xscreensaver loads without any warnings.
	   Check if lubuntu-grub-theme gets installed and selected by default on new installations.

Reviewers: kc2bez, wxl, tsimonq2

Reviewed By: wxl

Differential Revision: https://phab.lubuntu.me/D66

desktop

@@ -103,6 +103,7 @@ Task-Metapackage: lubuntu-desktop
  * xscreensaver-gl
  * xscreensaver-gl-extra
  * xscreensaver-data-extra
+ * xfonts-efont-unicode
 
 == Office ==
 
@@ -138,6 +139,7 @@ Task-Metapackage: lubuntu-desktop
 
  * papirus-icon-theme
  * arc-theme
+ * lubuntu-grub-theme
 
 == Other ==
  * (ttf-ancient-fonts-symbola)      # Emoji support