Set accepted files for job spreadsheet upload

app/templates/views/check/column-errors.html

@@ -137,6 +137,7 @@
       {% if not request.args.from_test %}
         {{ file_upload(
           form.file,
+          allowed_file_extensions=allowed_spreadsheet_file_extensions,
           action=url_for('.send_messages', service_id=current_service.id, template_id=template.id),
           button_text='Upload your file again'
         ) }}

app/templates/views/check/row-errors.html

@@ -43,6 +43,7 @@
     <div class="form-group">
       {{ file_upload(
         form.file,
+        allowed_file_extensions=allowed_spreadsheet_file_extensions,
         action=url_for('.send_messages', service_id=current_service.id, template_id=template.id),
         button_text='Upload your file again'
       ) }}

app/templates/views/send.html

@@ -19,6 +19,7 @@
   <div class="page-footer bottom-gutter">
     {{file_upload(
       form.file,
+      allowed_file_extensions=allowed_spreadsheet_file_extensions,
       button_text='Choose a file'
     )}}
   </div>