pylint: fix indentation in manifest_xml

This fixes pylint warning:

************* Module manifest_xml
W:975, 0: Bad indentation. Found 8 spaces, expected 6 (bad-indentation)

Change-Id: I967212f9439430351836ebdc27e442d7b77476e2
Signed-off-by: Stefan Beller <sbeller@google.com>
1 file changed