fix(coap): debug log format

[cisiqo]

Using this command, the log output screenshot is as follows. The uri_query printout is incorrect.

coap-client -m post -e "" "coap://127.0.0.1/mqtt/connection?clientid=0622ff402c06010122ff&username=admin&password=public"

Summary

🤖[deprecated] Generated by Copilot at eec005a

Optimize CoAP gateway performance and memory by using ~0p modifier in format function of emqx_coap_frame.erl

PR Checklist

Please convert it to a draft if any of the following conditions are not met. Reviewers may skip over until all the items are checked:

• [ ] Added tests for the changes
• [ ] Added property-based tests for code which performs user input validation
• [ ] Changed lines covered in coverage report
• [ ] Change log has been added to changes/(ce|ee)/(feat|perf|fix|breaking)-<PR-id>.en.md files
• [ ] For internal contributor: there is a jira ticket to track this change
• [ ] Created PR to emqx-docs if documentation update is required, or link to a follow-up jira ticket
• [ ] Schema changes are backward compatible

Checklist for CI (.github/workflows) changes

• [ ] If changed package build workflow, pass this action (manual trigger)
• [ ] Change log has been added to changes/ dir for user-facing artifacts update

[id]

ping @HJianBo