element-{web-unwrapped,desktop}: update license to AGPLv3

or older, upstream changed licenses in:
https://github.com/element-hq/element-web/commit/85d5c2aafc8e3cc8203d8ededa12d6a45a8c6ae7
https://github.com/element-hq/element-desktop/commit/238d5e3f1b63603b1d8471d603db8617f07554f9

pkgs/by-name/el/element-desktop/package.nix

@@ -172,7 +172,7 @@ stdenv.mkDerivation (
       description = "Feature-rich client for Matrix.org";
       homepage = "https://element.io/";
       changelog = "https://github.com/element-hq/element-desktop/blob/v${finalAttrs.version}/CHANGELOG.md";
-      license = lib.licenses.asl20;
+      license = lib.licenses.agpl3Plus;
       teams = [ lib.teams.matrix ];
       platforms = electron.meta.platforms ++ lib.platforms.darwin;
       mainProgram = "element-desktop";

pkgs/by-name/el/element-web-unwrapped/package.nix

@@ -86,7 +86,7 @@ stdenv.mkDerivation (
       homepage = "https://element.io/";
       changelog = "https://github.com/element-hq/element-web/blob/v${finalAttrs.version}/CHANGELOG.md";
       teams = [ lib.teams.matrix ];
-      license = lib.licenses.asl20;
+      license = lib.licenses.agpl3Plus;
       platforms = lib.platforms.all;
     };
   }