Debugger: Switch off external python in tests properly

Change-Id: Ic28cff5962b03e0a30c9c67526027b3e2799e738
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

tests/auto/debugger/tst_dumpers.cpp

@@ -1083,7 +1083,7 @@ void tst_Dumpers::dumper()
         cmds = "set confirm off\n"
                 "file doit\n"
                 "set print object on\n"
-                "set auto-load python-scripts no\n";
+                "set auto-load python-scripts off\n";
 
         cmds += "python sys.path.insert(1, '" + dumperDir + "')\n"
                 "python sys.path.append('" + uninstalledData + "')\n"