Update copyright.

debian/changelog

@@ -1,4 +1,4 @@
-lubuntu-artwork (21.04.1) hirsute; urgency=medium
+lubuntu-artwork (21.04.1~ppa1) hirsute; urgency=medium
 
   [ Hans P Möller ]
   * Added Lubuntu Breeze Openbox Theme.

debian/copyright

@@ -85,8 +85,6 @@ License: CC-BY-SA-4.0
  .
  Attribution-ShareAlike 4.0 International
  .
- =======================================================================
- .
  Creative Commons Corporation ("Creative Commons") is not a law firm and
  does not provide legal services or legal advice. Distribution of
  Creative Commons public licenses does not create a lawyer-client or
@@ -137,8 +135,6 @@ License: CC-BY-SA-4.0
      for the public:
 	     wiki.creativecommons.org/Considerations_for_licensees
  .
- =======================================================================
- .
  Creative Commons Attribution-ShareAlike 4.0 International Public
  License
  .