[FIX] util.move_model: modify email_template only if model column exists

In [move_model], we were always updating the `email.template` model,
even if the model is replaced by `mail.template` since OpenERP 9.0.
The problem is that it prevents users from creating a custom `email.template` model
even if it is not used in standard since version 8.0.

Related issue :
- [PR-specific](odoo/upgrade-specific#20818)

[move_model]: https://github.com/odoo/upgrade-util/blob/f97b7a28ef62fe4a7b0417854a904d132adc9882/src/util/modules.py#L1271

Author: MrRose765

src/util/modules.py

@@ -1268,8 +1268,11 @@ def update_imd(data_model, path):
     update_imd("ir.actions.act_window", path="res_model")
     update_imd("ir.actions.server", path="model_id.model")
     update_imd("ir.actions.report", path="model")
-    update_imd("email.template", path="model")  # OpenERP <= 8.0
-    update_imd("mail.template", path="model")
+    if column_exists(cr, "email_template", "model"):
+        # OpenERP <= 8.0
+        update_imd("email.template", path="model")
+    else:
+        update_imd("mail.template", path="model")
     if column_exists(cr, "ir_cron", "model"):
         # < 10.saas~14
         update_imd("ir.cron", path="model")