Fix: add inbox as default routing preference for custom delivery

[joshshowalter]

Description

• Currently if you click Customize Delivery Channel it will enable channels except inbox selected. This fixes this functionality to show inbox selected properly
• fixes C-10211

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (main@263b066). Click here to learn what that means.
Patch has no changes to coverable lines.

Additional details and impacted files

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  Coverage        ?   35.96%           
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  Files           ?       69           
  Lines           ?     1190           
  Branches        ?      362           
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  Hits            ?      428           
  Misses          ?      762           
  Partials        ?        0           

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[linear]

C-10211 Custom Delivery Channel Duplicating Inbox Messages

Producepay flagged an issue where the delivery channel customization triggers duplicate Inbox messages.

https://trycourier.slack.com/archives/C02GNDVGY6B/p1692909717191089?thread_ts=1692726692.213809&cid=C02GNDVGY6B

duplicate.mp4

notifications_problem.mp4