Fix regressed test case

This pull request fix regressed test case ``DynamoCoreUITests.RecordedTestsDSEngine.Defect_MAGN_904``.

This is because a recent change that temporary variable name is shorten (pull request: #3030), therefore in this UI test, the original two long statements no longer occupies 6 lines (each one occupies 3 lines) but only 2 lines, so output port position is shifted up. 

@Benglin please help to review the change.