CoAP: Fix recovering from incorrect IPv6 address at start

[Jc2k]

We only set the updated address when there was an encryption context. That meant we couldn't fix the IP if it was wrong at startup.

Fixes: https://community.home-assistant.io/t/homekit-accessory-protocol-hap-over-coap-udp-was-nanoleaf-essentials-bulb-via-thread-coap/335167/311?u=jc2k.

[codecov]

Codecov Report

Base: 66.83% // Head: 66.84% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (d2716ae) compared to base (14457a8).
Patch coverage: 66.66% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #259   +/-   ##
=======================================
  Coverage   66.83%   66.84%           
=======================================
  Files          71       71           
  Lines        6664     6666    +2     
=======================================
+ Hits         4454     4456    +2     
  Misses       2210     2210           

Flag	Coverage Δ
unittests	66.84% <66.66%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
aiohomekit/controller/coap/connection.py	29.92% <ø> (+0.15%)	⬆️
aiohomekit/controller/coap/pairing.py	32.08% <50.00%> (+0.02%)	⬆️
aiohomekit/controller/ip/pairing.py	78.62% <100.00%> (+0.08%)	⬆️
aiohomekit/controller/ble/client.py	33.33% <0.00%> (ø)

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[Jc2k]

Cheers!