i18n: fix typo in excluded key

refs FOO-1614
flag = none

test plan: `bundle exec rake i18n:generate` does not include any values
like `!ruby/object:Proc {}`

Change-Id: I5013f759f5274573e60264e6aa844fabff6a7ad6
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/259241
Reviewed-by: Ahmad Amireh <ahmad@instructure.com>
QA-Review: Ahmad Amireh <ahmad@instructure.com>
Product-Review: Ahmad Amireh <ahmad@instructure.com>
Tested-by: Service Cloud Jenkins <svc.cloudjenkins@instructure.com>

gems/i18n_tasks/lib/tasks/i18n.rake

@@ -356,7 +356,7 @@ namespace :i18n do
   def remove_unwanted_translations(translations)
     translations['date'].delete('order')
     translations['number'].fetch('nth', {}).delete('ordinals')
-    translations['number'].fetch('nth', {}).delete('ordinalize')
+    translations['number'].fetch('nth', {}).delete('ordinalized')
   end
 
   def autoimport(source_translations, new_translations)