Change detail tablet fixes

Always restart loaders as calling initLoader will return the
 old data. For tablets this means that selecting a new change
 will have no effect.
Fix parameters in GerritURL, status, owner and project are
 ignored for change detail queries when we have a change
 number.

Change-Id: I7b0d5bdc98714268d8b34755b3be18584a04b2ef