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Problem/Feature

Fixes #340, the channel.subscription.gift had its tier hardcoded to 1000 rather than using the value set in params.tier.

Description of Changes:

• Removed the hardcoded tier from the channel.subscription.gift event

Checklist

• My code follows the Contribution Guide
• I have self-reviewed the changes being requested
• I have made comments on pieces of code that may be difficult to understand for other editors
• I have updated the documentation (if applicable)