Force upgrade of kali-desktop-xfce to 2019.4.16 to ensure we have whiskerplugin.

debian/changelog

@@ -7,6 +7,8 @@ kali-themes (2019.4.9) kali-experimental; urgency=medium
   * Always add the missing diversions on upgrade
   * Add empty directories to kali-desktop-base so that update-alternatives can
     create symlinks in them.
+  * Force upgrade of kali-desktop-xfce to 2019.4.16 to ensure we have
+    whiskerplugin.
 
   [ Daniel Ruiz de Alegría ]
   * Fix light variant qterminal theme

debian/control

@@ -46,7 +46,7 @@ Depends: kali-themes-common (= ${source:Version}),
 # For boot-time splash screen
  plymouth-label,
  ${misc:Depends}
-Breaks: kali-defaults (<< 2019.4.0)
+Breaks: kali-defaults (<< 2019.4.0), kali-desktop-xfce (<< 2019.4.16)
 Replaces: kali-defaults (<< 2019.4.0)
 Description: Configure all desktops to use the Kali theme
  Installing this package should configure most desktops to use the Kali theme