avfilter/tonemapx: fix more range handling #1020

Job	Run time
build_portable_mac / Build Portable FFmpeg (macos-13, x86_64)	16m 28s
build_portable_linux / Build Portable FFmpeg (amd64)	16m 26s
build_portable_windows / Build Portable FFmpeg (win64)	16m 26s
build_portable_mac / Build Portable FFmpeg (macos-14, arm64)	16m 28s
build_portable_linux / Build Portable FFmpeg (arm64)	16m 25s
build_debian / Build FFmpeg (bullseye, amd64)	8m 30s
build_portable_windows_clang / Build Portable FFmpeg (CLANG64, win64)	16m 19s
build_debian / Build FFmpeg (bullseye, arm64)	8m 28s
build_ubuntu / Build FFmpeg (focal, amd64)	9m 31s
build_debian / Build FFmpeg (bullseye, armhf)	8m 34s
build_ubuntu / Build FFmpeg (focal, arm64)	9m 16s
build_debian / Build FFmpeg (bookworm, amd64)	8m 27s
build_ubuntu / Build FFmpeg (focal, armhf)	9m 33s
build_debian / Build FFmpeg (bookworm, arm64)	8m 11s
build_ubuntu / Build FFmpeg (jammy, amd64)	9m 32s
build_debian / Build FFmpeg (bookworm, armhf)	8m 27s
build_ubuntu / Build FFmpeg (jammy, arm64)	9m 33s
build_ubuntu / Build FFmpeg (jammy, armhf)	9m 33s
build_ubuntu / Build FFmpeg (noble, amd64)	9m 32s
build_ubuntu / Build FFmpeg (noble, arm64)	9m 31s
build_ubuntu / Build FFmpeg (noble, armhf)	58s
build_debian / Publish Release	0s
build_ubuntu / Publish Release	0s
build_portable_windows_clang / Publish Portable Release	1s
build_portable_linux / Publish Portable Release	1s
build_portable_windows / Publish Portable Release	1s
build_portable_mac / Publish Portable Release	1s
	3h 46m 12s

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