Use simple yml style

In order to avoid issues with scan-copyrights not dealing with !!bool in
yaml files, switch to a simpler format.

This kind of issue was seen in packages that ship their own configuration
in d/fill.copyright.blanks.yml, and uses the skip (boolean) option,
which triggers an error an prevents the pipeline to succeed.

As the issue seems to be an upstream bug, as a workaround change the
default_style used by yaml dumper from | to the default one, which
does not add !!bool.

Previously the default_style | was needed as scan-copyright used
YAML::Tiny and it was not able to parse the files properly, however,
after switching to YAML::XS this doesn't seem to be an issue any more,
so default_style can be used with its default.

Signed-off-by: Walter Lozano <walter.lozano@collabora.com>

package-source-builder/overlay/usr/bin/ci-license-scan

@@ -300,7 +300,7 @@ def configure_scanner():
                 except:
                     pass
         if copyright_overrides:
-            debian_copyright_overrides.write_text(yaml.safe_dump(copyright_overrides, default_style='|'))
+            debian_copyright_overrides.write_text(yaml.safe_dump(copyright_overrides))
 
 class NullFilter(BufferedReader):
     """