Fixed the handling of oneToOne conversations for certain apps

Certain apps were using specific white-spaces in order to get
an effect they wanted on the old messaging style. We're now
fixing that to ensure that the transition is smoothed

Test: manual send messages using multiple apps
Bug: 63708826
Change-Id: Ie8628c5b394b974f3dfcbbc6f26a7f50bc60a7b9