xmlops: fixed internal module name

- c&p error propagated when the module was split from presence_xml
- reported by Olle E. Johansson
(cherry picked from commit 1d51ef127bc546cbe7e950dedc135a529e9ed2aa)

modules/xmlops/xmlops_mod.c

@@ -58,7 +58,7 @@ static param_export_t params[]={
 
 /** module exports */
 struct module_exports exports= {
-	"presence_xml",		/* module name */
+	"xmlops",		/* module name */
 	 DEFAULT_DLFLAGS,	/* dlopen flags */
 	 0,  			/* exported functions */
 	 params,		/* exported parameters */