[FIX] mrp: fix typo in mrp_immediate_production_views

Typo error detected on `/mrp/wizard/mrp_immediate_production_views.xml`.
It doesn't cause any issue on module installation or updates, but
it's probably gonna cause issue on view inheritance.

If you can confirm this is unintended typo I will edit commit msg.
I also detected this on version 15.0 and 16.0.

closes odoo/odoo#134070

Signed-off-by: William Henrotin (whe) <whe@odoo.com>