d/copyright: Fix identation

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passed #357722
build

00:03:01

 
  Test
passed #357727
autopkgtest

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passed #357728
blhc

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passed #357726
lintian

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passed #357729
piuparts

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passed #357725
reprotest

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passed #357724
test-build-all

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passed #357723
test-build-any

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