[macosx] NofocusListDblClickTest should wait between doublr clicks

Running with mac port, closed/java/awt/NofocusListDblClickTest clicks by robot 4 times without delay and expects 2 ActionEvents. However all clicks coming in fast succession are treated by the system as a single 4-click or whatever multiple-click you manage to produce so there is only one ActionEvent fired.

Entering a reasonable delay (>500 ms) between double clicks fixes the test. Target functionality seems working since b 218 of macport.