Channels uses tags allowing to categorize and filter content. For that
purpose a m2m exists between channels (slide.channel) and tags (slide.channel
.tag). The 2many relationship from tags to channels holds however a wrong
comodel name. It has no impact on code since relationship table is
correctly defined and current code does not use the channel_ids fields
from tags.

closes odoo/odoo#42244

X-original-commit: 46c3ac94485292c59fdfe4b21a8e32eef9d1f998
Signed-off-by: Thibault Delavallee (tde) <tde@openerp.com>