FS-11998: [Core] Fix improper json_api module unload

src/switch_loadable_module.c

@@ -1360,7 +1360,7 @@ static switch_status_t switch_loadable_module_unprocess(switch_loadable_module_t
 
 
 				if (switch_event_create(&event, SWITCH_EVENT_MODULE_UNLOAD) == SWITCH_STATUS_SUCCESS) {
-					switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "type", "api");
+					switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "type", "json_api");
 					switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "name", ptr->interface_name);
 					switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "description", switch_str_nil(ptr->desc));
 					switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, "syntax", switch_str_nil(ptr->syntax));