[REM] theme_*: remove snippet options after website refactor

*: theme_clean, theme_common, theme_enark

Following the website refactor [1], that code is not used anymore.

[1]: https://github.com/odoo/odoo/commit/9fe45e2b7ddbbfd0445ffe25a859e67a316d02b2

closes odoo/design-themes#1125

Related: odoo/odoo#218357
Related: odoo/enterprise#89955
Related: odoo/upgrade#8131
Signed-off-by: Serge Bayet (seba) <seba@odoo.com>

theme_enark/__manifest__.py

@@ -9,7 +9,6 @@
     'data': [
         'data/generate_primary_template.xml',
         'data/ir_asset.xml',
-        'views/snippets_options.xml',
         'views/image_library.xml',
 
         'views/snippets/s_closer_look.xml',