Stop whitelist form autocompleting

The browser tries to be helpful by autofilling email addresses and
phone numbers. But it gets confused and tries to fill all the fields
with the same email address or phone number. This looks broken.

This commit disables autocomplete for these form fields.

app/templates/components/list-entry.html

@@ -1,7 +1,8 @@
 {% macro list_entry(
   field,
   item_name,
-  hint=''
+  hint='',
+  autocomplete=True
 ) %}
 
   {% if error %}
@@ -40,6 +41,7 @@
               id="input-{{ field.name }}-{{ index }}"
               class="form-control form-control-1-1"
               value="{{ field.data[index] }}"
+              {% if not autocomplete %}autocomplete="off"{% endif %}
             />
           </div>
         {% endfor %}

app/templates/views/api/whitelist.html

@@ -22,11 +22,13 @@
         {{ list_entry(
           form.email_addresses,
           item_name='email address',
+          autocomplete=False
         ) }}
 
         {{ list_entry(
           form.phone_numbers,
           item_name='phone number',
+          autocomplete=False
         ) }}
 
       </div>