Disable wrap parameters on submission controller

wrap parameters wraps the body parameters sent via a JSON request in
a submission hash. We don't want that for our submissions.

app/controllers/submissions_controller.rb

@@ -1,6 +1,7 @@
 require 'google/apis/sheets_v4'
 class SubmissionsController < ApplicationController
   skip_before_action :verify_authenticity_token
+  wrap_parameters false
 
   def create
     @form = Form.find_by!(token: params[:form_id])