Bring back time formatting for single line clock

Use old date format for the single line clock, so that we now
support (for single line clock) different clock representations.
For example, French Canadian uses an h instead of a colon
(13 h 01 instead of 13:01).

Test: manual
Bug: 186726401
Fixes: 191761465
Change-Id: If97a49780029f24dc99625a310729630b69e7a68