[sailfish-browser] Close vkb when opening context menu. Contributes to JB#36163
[sailfish-browser] Close vkb when opening context menu. Contributes to JB#36163

Give focus to the other window and hide virtual keyboard.

sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser,sailfishos/sailfish-browser