web app: Add scrollbar to program guide listing #14

Job	Run time
Building MythTV on macOS 13 (Ventura) x86_64 using clang	9m 42s
Building MythTV on Ubuntu interim	5m 39s
Building MythTV on macOS 14 (Sonoma) arm64 using clang	2m 28s
Building MythTV on Ubuntu LTS	5m 30s
Building MythTV on Ubuntu devel	5m 37s
Building MythTV on Debian stable	5m 26s
Building MythTV on Fedora	4m 55s
Building MythTV on Fedora - Qt6	5m 20s
Building MythTV on Fedora - clang	5m 37s
Building MythTV on Fedora - CMake	8m 52s
	59m 6s

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