user32:tests:Add test for ES_WANTRETURN style

[Anatoly Lyutin]

I add this test because I observe disagreeably feature of edit control: 
If in dialog attends DEFPUSHBUTTON and edit have ES_WANTRETURN | 
ES_MULTILINE styles and was pushed VK_RETURN the DEFPUSHBUTTON has 
BN_CLICKED. It accords describing on MSDN but in a fact it is not true.
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