Made `ceev run' actually run the SDL2 demo

src/ceev.cc

@@ -195,7 +195,7 @@ int run_project(std::deque<std::string> args) {
   std::cout << "Author: " << data.author << '\n';
   std::cout << "Email: " << data.email << '\n';
   std::cout << "Running project..." << std::endl;
-  return 0;
+  return devel_sdl2(args);
 }
 
 int clean_project(std::deque<std::string> args) {