Filter out the duplicate click event on menu page

Whenever the highlighted item is clicked, Settings shouldn't start the
second-layer page again even if the user goes to its child page.
Ex. When the user goes to the Tethering page, clicking on the menu
entry "Network & Internet" should not switch to the page.

Exception: in the deep link case, allow the first click event on the
highlighted item to launch the second-layer page when the page is not
the same as the one on the right pane.

Fix: 215267159
Test: manual, robotest
Change-Id: I2315e0069facc4867cb157752b1a3144716b7d17