Fixes bug where delete option from Menu list is disabled in Contact view mode.

Bug was caused by the count increment logic being removed in the next submitted change
https://android-git.corp.google.com/w/?p=platform/packages/apps/Contacts.git;a=commit;h=df18120ed2c37a45eb47e39c4da0c8e3b6eb335c
Disabled menu was removed in some other subsequent change, so adding dialog for the case when writable contacts = 0.

Changes delete contact bebavior in EditContactActivity to be same
ViewContactActivity.

Updates dialog message for readonly contact deletion.

bug 2161222
Dr No : TS
Reviewed By: dplotnikov, timsullivan