[FIX] *: clean useless content in manifests

Make sure the linting test added in community do not fail.

closes odoo/design-themes#669

X-original-commit: f78f8df161
Signed-off-by: Romain Derie (rde) <rde@odoo.com>
Signed-off-by: Victor Feyens (vfe) <vfe@odoo.com>

theme_notes/__manifest__.py

@@ -5,7 +5,6 @@
     'summary': 'Band, Musics, Sound, Concerts, Artists, Records, Event, Food, Stores',
     'sequence': 280,
     'version': '2.1.0',
-    'author': 'Odoo S.A.',
     'depends': ['theme_common'],
     'data': [
         'data/ir_asset.xml',