Remove again useless call to ->assert in unit tests about progressbar.
Remove again useless call to ->assert in unit tests about progressbar.

mageekguy/atoum,vonglasow/atoum,GuillaumeDievart/atoum,CedCannes/atoum,gpaton/atoum,mikaelrandy/atoum,mikaelrandy/atoum,vonglasow/atoum,tejerka/atoum,agallou/atoum,jubianchi/atoum,tejerka/atoum,agallou/atoum,GuillaumeDievart/atoum,Tiross/atoum,mageekguy/atoum,Tiross/atoum,jubianchi/atoum,CedCannes/atoum,gpaton/atoum