Squish: Remove workaround

Just doing as the great wise frog tells me.

Change-Id: I73c07142cd902ac3b89f8c00597087d7d550a2ee
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

tests/system/shared/qtcreator.py

@@ -121,10 +121,6 @@ def waitForCleanShutdown(timeOut=10):
                 break
 
 def checkForStillRunningQmlExecutable(possibleNames):
-    if JIRA.isBugStillOpen(12644):
-        possibleNames.append('WerFault.exe')
-    else:
-        test.warning("Remove temporary workaround for QTCREATORBUG-12644!")
     for qmlHelper in possibleNames:
         tasks = subprocess.Popen("tasklist /FI \"IMAGENAME eq %s\"" % qmlHelper, shell=True,
                                  stdout=subprocess.PIPE)