Git: Remove wrong assertions

Changed in 89523c14

Change-Id: I872c37633a877e982046b2a44266159d86defbde
Reviewed-by: Eike Ziller <eike.ziller@digia.com>
Reviewed-by: Petar Perisin <petar.perisin@gmail.com>
Reviewed-by: hjk <hjk121@nokiamail.com>
Git: Reorder reset types

Hard is now the default (as it is in 2.7), and the types are
properly ordered

Task-number: QTCREATORBUG-9733
Change-Id: I54fb22543bf31f43381e57fb0acf4aeb15e8a293
Reviewed-by: hjk <hjk121@nokiamail.com>
Reviewed-by: Robert Loehning <robert.loehning@digia.com>