(PDK-430) Do not cache template-url answer if using the default template

lib/pdk/generators/module.rb

@@ -68,7 +68,7 @@ def self.invoke(opts = {})
           end
         end
 
-        PDK.answers.update!('template-url' => template_url)
+        PDK.answers.update!('template-url' => template_url) unless template_url == default_template_url
 
         begin
           FileUtils.mv(temp_target_dir, target_dir)

spec/unit/pdk/generate/module_spec.rb

@@ -191,6 +191,7 @@
 
             it 'uses the vendored template url' do
               expect(PDK::Module::TemplateDir).to receive(:new).with('file:///tmp/package/cache/pdk-module-template.git', anything).and_yield(test_template_dir)
+              expect(PDK.answers).not_to receive(:update!).with(:'template-url' => anything)
 
               described_class.invoke(invoke_opts)
             end
@@ -199,6 +200,7 @@
           context 'and pdk is not installed from packages' do
             it 'uses the default template to generate the module' do
               expect(PDK::Module::TemplateDir).to receive(:new).with(described_class.default_template_url, anything).and_yield(test_template_dir)
+              expect(PDK.answers).not_to receive(:update!).with(:'template-url' => anything)
 
               described_class.invoke(invoke_opts)
             end