Bug #992120 Pressing "Home" button will discard the contact info when creating new contact/editing an existed contact

[bug number  ] 992120
[root cause  ] save contact draft
[changes     ]
[side effects]
[self test   ] pass
[reviewers   ]
Merge pull request #18967 from leonazhao/bug992120_v1.3t

Bug 992120 Pressing "Home" button will discard the contact info when creating new contact/editing an existed contact, r=andreas