wmltools: fix wmlscope crash in collection of unresolved macro calls

While testing wmlscope without including data/core, which guarantees lots
of "unresolved" references, I got a crash pointing to this line with the
traceback: "NameError: global name 'args' is not defined".

At first, I thought the crash might have been caused by my splitting out
parse_macroref into its own function, several months ago. However, the
line is at the wrong indentation level for those "args" to be the variable
referenced here. So what "args" might have been intended?

After tracking down the commit that added "args=args" to this line, I've
concluded that this was simply a mistake. ESR isn't around to ask anymore,
but if a macro was never defined, or is not called correctly, what "args"
could be relevant?

data/tools/wesnoth/wmltools.py

@@ -632,7 +632,7 @@ class CrossRef:
                             if len(candidates) > 1:
                                 print "%s: more than one definition of %s is visible here (%s)." % (Reference(ns, fn, n), name, "; ".join(candidates))
                         if len(candidates) == 0:
-                            self.unresolved.append((name,Reference(ns,fn,n+1,args=args)))
+                            self.unresolved.append((name,Reference(ns,fn,n+1)))
                     # Don't be fooled by HTML image references in help strings.
                     if "<img>" in line:
                         continue