test: Run unit tests regardless of 'Supported' amendment status (#5537)

src/test/app/Credentials_test.cpp

@@ -1090,7 +1090,7 @@ struct Credentials_test : public beast::unit_test::suite
     run() override
     {
         using namespace test::jtx;
-        FeatureBitset const all{supported_amendments()};
+        FeatureBitset const all{testable_amendments()};
         testSuccessful(all);
         testCredentialsDelete(all);
         testCreateFailed(all);