Add failing test for use-order rule when using a trait

The error which is reported:

    (
    	[message] => use found on line 48, but require was declared on line 7. Statements should be ordered `namespace`, `use`, `const`, `require`, then code.
    	[source] => HM.Layout.Order.WrongOrder
    	[listener] => HM\Sniffs\Layout\OrderSniff
    	[severity] => 5
    	[fixable] =>
    )

It should be possible to `use` a trait within a class, without
triggering the warning for a top-level namespace `use` statement.

Author: kadamwhite

tests/fixtures/pass/use-order.php

@@ -2,6 +2,7 @@
 
 use Foo\Bar;
 use Foo\Baz as Zztop;
+use Some_Trait;
 
 require( 'some/file/that/exists.php' );
 
@@ -42,3 +43,7 @@
 $c = function() {
 	return true;
 };
+
+class My_Class {
+	use Some_Trait;
+}