Progressbars: use default frame thickness

It's unnecessary overhead to set the value everywhere, except it's needed.


Origin commit data
------------------
Commit: f70a30defa
Author: Thilo Graf <dbt@novatux.de>
Date: 2013-04-05 (Fri, 05 Apr 2013)

src/gui/infoviewer_bb.cpp

@@ -819,14 +819,12 @@ void CInfoViewerBB::changePB()
 	if (hddscale)
 		delete hddscale;
 	hddscale = new CProgressBar();
-	hddscale->setFrameThickness(0);
 	hddscale->setBlink();
 	hddscale->setInvert();
 	
 	if (sysscale)
 		delete sysscale;
 	sysscale = new CProgressBar();
-	sysscale->setFrameThickness(0);
 	sysscale->setBlink();
 	sysscale->setInvert();
 }