message: fix up enum value for GST_MESSAGE_DEVICE_CHANGED

This was added in 1.16 and accidentally duplicated the value of
the existing GST_MESSAGE_REDIRECT.

As the only known user of this message is GStreamer core itself,
and it is quite an obscure message, it seems best to just fix up
the enum value even if that technically breaks API.

Fixes #418
21 jobs for backport-mr-215-into-1.16-fix-up-device-changed-message-enum in 56 minutes and 31 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Preparation
passed #489962
gst indent

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passed #489961
manifest

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  Build
passed #489968
build cerbero android universal

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build cerbero cross win32

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build cerbero cross win64

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build cerbero fedora x86_64

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passed #489972
gst-ios-12.2
build cerbero ios universal

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passed #489971
gst-macos-10.14
build cerbero macos x86_64

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passed #489963
build fedora x86_64

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passed #489964
build nodebug fedora x86_64

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build static fedora x86_64

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passed #489966
build static nodebug fedora x86_64

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  Test
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check fedora

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integration testsuites fedora

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valgrind bad

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valgrind base

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valgrind core

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valgrind ges

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valgrind good

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valgrind ugly

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  Integrate
passed #489981
android universal examples

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