Non-string value in `authorizing_integration_owners`

[FedorLap2006]

Description

When triggering interaction from within a bot's DM, authorizing_integration_owners[GUILD_INSTALL] contains a number, instead of a string

Steps to Reproduce

1. Register a command with GUILD_INSTALL integration type
2. Prepare the session and listen for events
3. Trigger the said command in bot's DM

Expected Behavior

A string value, in this case "0", as documented.

Current Behavior

A number (i.e. 0).

Screenshots/Videos

No response

Client and System Information

Unreleased version of DiscordGo (ucommands branch)