peertube-viewer: clean up package a bit (#342146)

Author: OPNA2608

pkgs/by-name/pe/peertube-viewer/package.nix

@@ -4,7 +4,7 @@
   rustPlatform,
 }:
 
-rustPlatform.buildRustPackage rec {
+rustPlatform.buildRustPackage {
   pname = "peertube-viewer";
   version = "1.8.6";
 
@@ -22,5 +22,6 @@ rustPlatform.buildRustPackage rec {
     homepage = "https://gitlab.com/peertube-viewer/peertube-viewer-rs";
     license = licenses.agpl3Only;
     maintainers = with maintainers; [ haruki7049 ];
+    mainProgram = "peertube-viewer-rs";
   };
 }