Stop using call origin when a dial intent is used

"Call origin" was introduced in I7b88b245e82e, to have
the app remember which tab is chosen when user's making
a phone call.

When a dial intent is used by 3rd party app, the tab
selection is done automatically and thus we should not
use the mechanism because the user didn't make a choice.

TESTED:
incoming calls
-> go back to calllog

outgoing calls
- make a phone call from dialpad -> go back to dialpad
- make a phone call from favorite -> go back to favorite
- make a phone call from calllog -> go to calllog
- make a phone call from call detail -> go to calllog
- make a phone call from People UI -> go to calllog
- make a phone call from dialpad and launch Phone UI
  again during the phone call
  -> go to calllog (strictly, "undetermined")
- make a phone call from contact card (reached via
  phone favorite) -> go to calllog
- make a phone call from favorite and add another
  person to the phone call via in-call ui
  -> go back to "favorite" (strictly, "undetermined")
- make a phone call from dialpad or favorite, bail out the
  in-call UI. Have the recipient hang up the call.
  Then have an incoming call again. Hang up the second phone
  call.
  -> go to calllog

new test for this fix:
- make a phone call per 3rd party's request
  -> go to calllog

Bug: 5728105
Change-Id: I48f03de752917c13046da629d9871155bcde2b10