kamailio.cfg: overwrite log level name for cfgtrace

- avoid mixing its messages with typical logs printed from code

(cherry picked from commit c3f57334976cd1b9741ea9336554c9ecfc3e014e)

etc/kamailio.cfg

@@ -445,6 +445,7 @@ modparam("xmlrpc", "url_match", "^/RPC")
 #!ifdef WITH_DEBUG
 # ----- debugger params -----
 modparam("debugger", "cfgtrace", 1)
+modparam("debugger", "log_level_name", "exec")
 #!endif
 
 ####### Routing Logic ########