x264enc: Change accepted caps width and height from [16, MAX] to [1, MAX]

There are cases where the video size might be less than 16x16.
This change allows the x264 encoder to accept this cases.
27 jobs for !44 with fix_x264_enc in 170 minutes and 2 seconds (queued for 3 seconds)
latest detached
Status Job ID Name Coverage
  Preparation
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gst indent

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manifest

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  Build
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gstreamer
build cerbero cross-android universal

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gst-ios-13.2
build cerbero cross-ios universal

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gstreamer
build cerbero cross win32

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gstreamer
build cerbero cross win64

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gstreamer
build cerbero fedora x86_64

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gst-macos-10.15
build cerbero macos x86_64

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build clang fedora x86_64

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build fedora x86_64

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docker windows 1809 gstreamer-windows allowed to fail manual
build msys2
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build nodebug fedora x86_64

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build static fedora x86_64

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build static nodebug fedora x86_64

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docker windows 1809 gstreamer-windows
build vs2017 amd64

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docker windows 1809 gstreamer-windows allowed to fail manual
build vs2017 x86
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docker windows 1809 gstreamer-windows
build vs2017 amd64

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docker windows 1809 gstreamer-windows
build vs2017 amd64

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  Test
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gstreamer
check fedora

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gstreamer
integration testsuites fedora 1/4

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gstreamer
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gstreamer
integration testsuites fedora 3/4

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gstreamer
integration testsuites fedora 4/4

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gstreamer
valgrind ugly

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  Integrate
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cross-android universal examples

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passed #2147410
gst-ios-13.2
cross-ios universal examples

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passed #2147409
documentation

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