Bugfix: URL-unescape nameaddr display names

[m.cicciotti@xxxxxxxxxxxxxx (Michele Cicciotti)]

Asterisk will escape URL-unsafe characters in nameaddr display names.
The attached patch ensures PJSIP unescapes URL-escaped display names
when it encounters them:

Index: pjsip/src/pjsip/sip_parser.c
===================================================================
@@ -1485,8 +1485,7 @@
     /* Trim the leading and ending quote */
     name_addr->display.ptr++;
     name_addr->display.slen -= 2;
-
+    /* Unescape */
+        name_addr->display = pj_str_unescape (pool, &name_addr->display);
     } else if (*scanner->curptr != '<') {
     int next;
     pj_str_t dummy;