configure.ac: follow the 2 space indent style
authorChristian Ehrhardt <christian.ehrhardt@canonical.com>
Fri, 18 Aug 2017 10:50:22 +0000 (12:50 +0200)
committerChristian Ehrhardt <christian.ehrhardt@canonical.com>
Fri, 18 Aug 2017 10:50:22 +0000 (12:50 +0200)
The rest of configure.ac indents not to the context, but by 2 spaces.
Follow that rule to stay in style.

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>

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