[phone-app] Improve contacts discovery

[Ingmar]

(ubuntu-phablet 3.4.0.5-make #31)

Steps to reproduce:
- Click on the contacts icon on the upper

Actual result:
(Sometimes it takes multiple taps because of the position of the icon near to the "switch between apps swipe" trigger)
- The search box on the top is shown but no focus and no keyboard are given

Expected result:
- The search box is there for a reason, so it should be focused with the keyboard shown by default
- Alternatively the Favourites tab could be presented

[Olga Kemmet (olga-kemmet)]

The position of the icon can not be changed, however the tap area might be increased in order to hit the taget.
If user invokes the contacts view, the search is not in focus therefor the OSK is not displayed on scree. This is intended behaviour and not a bug.
If user wants to search for a contact, he simply has to tap into the search field in the header and the OSK will be triggered.

[Ingmar (ingmars-mailbox-uone)]

In my opinion, opening the contacts view from within the dialer app should be handled like opening the contacts app and clicking on the search button, because it is not about editing/adding contacts (or just calling contacts beginning with an A) but finding contacts very quickly for a call. Maybe for consistency reasons, it is a good idea to change the contacts icon with the question mark (and add an increased tap area). It is possible to search for a desired number, so that a question mark on the dialer view is valid for such a function.