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

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