Simplify macro eval by returning a lazy double

spec/spectator/dsl/mocks/lazy_double_spec.cr

@@ -56,5 +56,10 @@ Spectator.describe "Lazy double DSL" do
       dbl = double
       expect { dbl.oops }.to raise_error(Spectator::UnexpectedMessage, /anonymous/i)
     end
+
+    it "accepts no name and predefined responses" do
+      dbl = double(foo: 42)
+      expect(dbl.foo).to eq(42)
+    end
   end
 end

src/spectator/dsl/mocks.cr

@@ -125,7 +125,7 @@ module Spectator::DSL
     # expect(dbl.foo).to eq(42)
     # ```
     macro double(**value_methods)
-      new_double({{**value_methods}})
+      ::Spectator::LazyDouble.new({{**value_methods}})
     end
   end
 end