Add mising hashtag to 'Closes' stanza in changelog

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  Build
passed #407636
build

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  Test
passed #407641
autopkgtest

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passed #407642
blhc

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passed #407640
allowed to fail
lintian

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passed #407643
piuparts

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passed #407639
reprotest

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passed #407638
test-build-all

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passed #407637
test-build-any

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