Simplified `ResolvePHP7Types` test - compatibility with type resolution suffices
Simplified `ResolvePHP7Types` test - compatibility with type resolution suffices

This test was breaking because `Roave\BetterReflection\Reflection\ReflectionUnionType::isBuiltin()` was
being called: such a method does not exist though, because it only exists on `ReflectionNamedType`.

That's because the test is designed without type inheritance in mind: removing the assertions is sufficient
here.

Roave/BetterReflection,asgrim/better-reflection,asgrim/better-reflection,Roave/BetterReflection