Fabric Tests: Change default constructor in TestComponents' TestProps (#29898)

Summary:
This pull request changes the default constructor in the `TestProps` class in `react/renderer/core/tests/TestComponent.h`

`using ViewProps::ViewProps;` was causing problems in Visual Studio 2017 - changing it to ` TestProps() = default;` allowed dependent CPP files to compile on MSVC and caused no regressions in the Fabric test suite.

## Changelog

Changelog: [Internal] [Changed] - Fabric Tests: Change default constructor in TestComponents' TestProps

Pull Request resolved: https://github.com/facebook/react-native/pull/29898

Test Plan: The Fabric test suite passes on Windows after this change is made. I also tested it under macOS and Linux built with Clang and they both pass with this change made.

Reviewed By: sammy-SC

Differential Revision: D23591986

Pulled By: shergin

fbshipit-source-id: 132e1c2e38fa74aa4f2c8746054d6152f30035e9

ReactCommon/react/renderer/core/tests/TestComponent.h

@@ -33,7 +33,7 @@ static const char TestComponentName[] = "Test";
 
 class TestProps : public ViewProps {
  public:
-  using ViewProps::ViewProps;
+  TestProps() = default;
 
   TestProps(const TestProps &sourceProps, const RawProps &rawProps)
       : ViewProps(sourceProps, rawProps) {}