[FIX] web: tooling: fix support for older tooling

Older tooling used prettier config files. The issue was that the
disable command of the tooling was also changed to not remove those
files as they shouldn't exist anymore.
But changing from 16 to master without manually triggering a tooling
"disable" would then left the prettier config and mess with the addons
eslint whitelist.

closes odoo/odoo#110582

Signed-off-by: Samuel Degueldre <sad@odoo.com>

addons/web/tooling/disable.sh

@@ -10,6 +10,11 @@ disableInDir () {
     rm package.json
     rm package-lock.json
     rm -r node_modules
+
+    # to support old versions
+    rm -f .prettierignore
+    rm -r .prettierrc.json
+
     cd - &> /dev/null
 }