bball_qml: Pass arguments to internal qmlscene

To use the bball_qml sample with a different Qt platform (i.e. linuxfb) 
we need to pass the @-platform@ parameter. However, this was not 
possible with the current bball_qml shell script.
Add pass the script arguments to qmlscene as well. 

BCS 746-000991

testcases/bball_qml/bball_qml

 #!/bin/sh
 
-qmlscene /opt/ltp/testcases/bin/bball.qml
+qmlscene /opt/ltp/testcases/bin/bball.qml "$@"