IRunControlFactory::displayName: Remove unused function

It's never used.

Change-Id: I11cc85b1d9a5944017b8a03738877f91cfe5d11f
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>

src/plugins/qnx/qnxruncontrolfactory.cpp

@@ -154,8 +154,3 @@ RunControl *QnxRunControlFactory::create(RunConfiguration *runConfig, RunMode mo
 
     return runControl;
 }
-
-QString QnxRunControlFactory::displayName() const
-{
-    return tr("Run on remote QNX device");
-}