AppArmor & SELinux: remove one indentation in XML files

Summary: This only removes an indentation inside the <language> tag, in the files "apparmor.xml", "selinux-cil.xml" & "selinux-fc.xml", since it's much more comfortable.

Reviewers: Framework: Syntax Highlighting, dhaumann, cullmann

Reviewed By: Framework: Syntax Highlighting, cullmann

Subscribers: kwrite-devel, kde-frameworks-devel

Tags: Kate, Frameworks

Differential Revision: https://phabricator.kde.org/D20220