Bugfix change erader email in /me page

cps/web.py

@@ -1368,8 +1368,8 @@ def change_profile(kobo_support, local_oauth_check, oauth_status, translations,
         if to_save.get("password"):
             current_user.password = generate_password_hash(to_save.get("password"))
     try:
-        if to_save.get("eReader_mail", current_user.kindle_mail) != current_user.kindle_mail:
-            current_user.kindle_mail = valid_email(to_save.get("eReader_mail"))
+        if to_save.get("kindle_mail", current_user.kindle_mail) != current_user.kindle_mail:
+            current_user.kindle_mail = valid_email(to_save.get("kindle_mail"))
         new_email = valid_email(to_save.get("email", current_user.email))
         if not new_email:
             raise Exception(_("Email can't be empty and has to be a valid Email"))