Fix schedule segment creation

[surdaft]

Schedule segments would fail due to missing broadcaster_id from query params.

I know I raised the schedules endpoint issue aaages ago, #192, I ended up changing direction and then eventually not testing the code that was pushed! 😅

[coveralls]

Pull Request Test Coverage Report for Build 23509478375

Details

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 92.965%

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Totals
Change from base Build 20669178114:	0.0%
Covered Lines:	1784
Relevant Lines:	1919

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💛 - Coveralls