ultrastar-{manager,creator}: specify mainProgram (#369670)

pkgs/tools/misc/ultrastar-creator/default.nix

@@ -27,7 +27,7 @@ mkDerivation {
   };
 
   postPatch = ''
-    # we don’t want prebuild binaries checked into version control!
+    # we don’t want prebuilt binaries checked into version control!
     rm -rf lib include
     sed -e "s|DESTDIR =.*$|DESTDIR = $out/bin|" \
         -e 's|-L".*unix"||' \
@@ -54,6 +54,7 @@ mkDerivation {
   ];
 
   meta = with lib; {
+    mainProgram = "UltraStar-Creator";
     description = "Ultrastar karaoke song creation tool";
     homepage = "https://github.com/UltraStar-Deluxe/UltraStar-Creator";
     license = licenses.gpl2Only;

pkgs/tools/misc/ultrastar-manager/default.nix

@@ -139,6 +139,7 @@ mkDerivation {
 
   meta = with lib; {
     description = "Ultrastar karaoke song manager";
+    mainProgram = "UltraStar-Manager";
     homepage = "https://github.com/UltraStar-Deluxe/UltraStar-Manager";
     license = licenses.gpl2Only;
     maintainers = with maintainers; [ Profpatsch ];