modules_k/perl: Fix resetting of flags in sv2int_str

According to the functions comments and its usages in the same file, the flags would only be or'red, not reset

This fixes setting an string named avp with an integer value:

OpenSER::AVP::add("string", 12345);

modules_k/perl/openserxs.xs

@@ -412,7 +412,6 @@ inline int sv2int_str(SV *val, int_str *is,
 	
 	if (SvIOK(val)) { /* numerical name */
 		is->n = SvIV(val);
-		*flags = 0;
 		return 1;
 	} else if (SvPOK(val)) {
 		s = SvPV(val, len);