Bug 5299484: Recipient address in to field is doubled when entering in landscape mode

A tap on a completion in the keyboard calls onCommitCompletion, which in turn calls
performCompletion because of the DropDownItemClickListener.

As a result, the text is replaced twice. Removing the first text replacement.

Change-Id: I4974d23c68ab25ca0ad0cda5abf25f30129b28ee