fix: remove empty construct when parent has no construct

[calebdw]

Hello!

Closes rectorphp/rector#9369

This fixes cases where an empty constructor isn't removed even when the parent does not have a constructor.

It turns out that the removed if statement is not needed, the previous conditions already prevent overridden methods from being removed.

Thanks!

[samsonasik]

Looks good, let's give it a try, thank you @calebdw

[samsonasik]

I see for trait use why already checked, there is IsClassMethodUsedAnalyzer::isClassMethodUsed() that check on trait already :)

[samsonasik]

Oh, it seems private empty __construct should be skipped as used on purpose to avoid instantiation

[samsonasik]

Ok, there is fixture for that already

rector-src/rules-tests/DeadCode/Rector/ClassMethod/RemoveEmptyClassMethodRector/Fixture/keep_private_constructor.php.inc

Lines 5 to 10 in e00f52f

	final class KeepPrivateConstructor
	{
	private function __construct()
	{
	}

that checked on ClassMethodManipulator::isNamedConstructor()