fix tts reserving channels #1166

Job	Run time
Run Linters	2m 37s
Collect data for other tasks	13s
Compile Maps	2m 22s
Windows Build	1m 51s
Integration Tests (icebox) / run_integration_tests	8m 57s
Integration Tests (deltastation) / run_integration_tests	9m 3s
Integration Tests (birdshot) / run_integration_tests	8m 43s
Integration Tests (gateway_test) / run_integration_tests	9m 42s
Integration Tests (metastation) / run_integration_tests	8m 36s
Integration Tests (multiz_debug) / run_integration_tests	7m 53s
Integration Tests (northstar) / run_integration_tests	9m 39s
Integration Tests (runtimestation) / run_integration_tests	7m 27s
Integration Tests (tramstation) / run_integration_tests	9m 5s
Integration Tests (wawastation) / run_integration_tests	8m 55s
Alternate Tests (515, 1627, runtimestation) / run_integration_tests	7m 31s
Check Alternate Tests	1s
Compare Screenshot Tests	15s
	1h 42m 50s

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