[gnome-control-center] build: Fix post-install script indentation

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit e776111bc0b309df9aa62526645ad844e3ebbbcb
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Mar 6 22:02:14 2018 -0300

    build: Fix post-install script indentation
    
    Python best practices say that indentation should be a
    multiple of 4.

 meson_post_install.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/meson_post_install.py b/meson_post_install.py
index 5c72c482e..f9119e1a7 100644
--- a/meson_post_install.py
+++ b/meson_post_install.py
@@ -8,8 +8,8 @@ gsettingsschemadir = os.path.join(sys.argv[1], 'glib-2.0', 'schemas')
 icondir = os.path.join(sys.argv[1], 'icons', 'hicolor')
 
 if not os.environ.get('DESTDIR'):
-  print('Compiling gsettings schemas...')
-  subprocess.call(['glib-compile-schemas', gsettingsschemadir])
+    print('Compiling gsettings schemas...')
+    subprocess.call(['glib-compile-schemas', gsettingsschemadir])
 
-  print('Update icon cache...')
-  subprocess.call(['gtk-update-icon-cache', '-f', '-t', icondir])
+    print('Update icon cache...')
+    subprocess.call(['gtk-update-icon-cache', '-f', '-t', icondir])