[FIX] sap.m.ObjectHeader: Prevent default on space key handling is always executed

Because of this, spaces cannot be used inside input controls which
are part of the object header.

Change-Id: If2e3efaa0331e542bd2f5f85b65f597d1f016c31
Merge "[FIX] sap.m.ObjectHeader: Prevent default on space key handling is always executed"