SysModuleBuiltins.BreakpointHookNode fix arity

Author: cosminbasca

graalpython/com.oracle.graal.python/src/com/oracle/graal/python/builtins/modules/SysModuleBuiltins.java

@@ -1312,7 +1312,7 @@ Object doHook(VirtualFrame frame, PythonModule sys, Object obj,
                     "\n" +
                     "This hook function is called by built-in breakpoint().\n")
     @GenerateNodeFactory
-    abstract static class BreakpointHookNode extends PythonVarargsBuiltinNode {
+    abstract static class BreakpointHookNode extends PythonBuiltinNode {
         static final String VAL_PDB_SETTRACE = "pdb.set_trace";
 
         @Child private ImportNode.ImportExpression importNode;