web-app: Fix line ends in channel scan log. #311

Job	Run time
Building MythTV on macOS 13 (Ventura) x86_64 using clang	10m 45s
Building MythTV on Ubuntu interim	6m 35s
Building MythTV on macOS 14 (Sonoma) arm64 using clang	5m 16s
Building MythTV on Ubuntu LTS	5m 54s
Building MythTV on Ubuntu devel	6m 0s
Building MythTV on Debian stable	5m 34s
Building MythTV on Fedora	5m 40s
Building MythTV on Fedora - Qt6	5m 33s
Building MythTV on Fedora - clang	5m 29s
Building MythTV on Fedora - CMake	9m 57s
	1h 6m 43s

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