Fix MPTS channel creation #81

Job	Run time
Building MythTV on macOS 12 (Monterey) x86_64 using clang	2h 43m 29s
Building MythTV on Ubuntu interim	5m 48s
Building MythTV on macOS 13 (Ventura) x86_64 using clang	3h 28m 21s
Building MythTV on Ubuntu LTS	5m 51s
Building MythTV on macOS 14 (Sonoma) x86_64 using clang	1h 49m 40s
Building MythTV on macOS 14 (Sonoma) arm64 using clang	1h 30m 14s
Building MythTV on Ubuntu devel	5m 42s
Building MythTV on Debian stable	5m 40s
Building MythTV on Fedora	5m 59s
Building MythTV on Fedora - Qt6	10m 6s
Building MythTV on Fedora - clang	5m 50s
Building MythTV on Fedora - CMake	9m 40s
	10h 26m 20s

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