Enable autosizing for some textboxes

This commit makes textboxes auto-resize any time they might be used to
enter long passages of text which would otherwise make them scroll
internally.

app/templates/views/organisations/organisation/settings/edit-go-live-notes.html

@@ -21,7 +21,7 @@
         belonging to this organisation requests to go live.
       </p>
       {% call form_wrapper() %}
-        {{ textbox(form.request_to_go_live_notes, width='1-1', rows=3) }}
+        {{ textbox(form.request_to_go_live_notes, width='1-1', rows=3, autosize=True) }}
         {{ page_footer('Save') }}
       {% endcall %}
     </div>

app/templates/views/platform-admin/returned-letters.html

@@ -13,7 +13,7 @@
   <div class="column-two-thirds">
     <h1 class="heading-large">Submit returned letters</h1>
     {% call form_wrapper() %}
-      {{ textbox(form.references, width='1-1', rows=8) }}
+      {{ textbox(form.references, width='1-1', rows=8, autosize=True) }}
       {{ page_footer("Submit") }}
     {% endcall %}
   </div>

app/templates/views/service-settings/branding/email-options.html

@@ -45,6 +45,7 @@
           form.something_else,
           hint='Include links to your brand guidelines or examples of how to use your branding',
           width='1-1',
+          autosize=True,
         ) }}
       {% endcall %}
     {% endif %}

app/templates/views/support/ask-question-give-feedback.html

@@ -17,7 +17,7 @@
     <div class="grid-row">
       <div class="column-two-thirds">
         {% call form_wrapper() %}
-            {{ textbox(form.feedback, width='1-1', hint='', rows=10) }}
+            {{ textbox(form.feedback, width='1-1', hint='', rows=10, autosize=True) }}
             {% if not current_user.is_authenticated %}
               <h3 class="heading-medium">Do you want a reply?</h3>
               <p>Leave your details below if you’d like a response.</p>

app/templates/views/support/report-problem.html

@@ -24,7 +24,7 @@
           </p>
         </div>
         {% call form_wrapper() %}
-            {{ textbox(form.feedback, width='1-1', hint='', rows=10) }}
+            {{ textbox(form.feedback, width='1-1', hint='', rows=10, autosize=True) }}
             {% if not current_user.is_authenticated %}
               {{ textbox(form.name, width='1-1') }}
               {{ textbox(form.email_address, width='1-1') }}