Fix: Make version changeable from the environment vars (#4654)

app/views/layouts/vueapp.html.erb

@@ -34,6 +34,7 @@
       window.chatwootConfig = {
         hostURL: '<%= ENV.fetch('FRONTEND_URL', '') %>',
         fbAppId: '<%= ENV.fetch('FB_APP_ID', nil) %>',
+        fbApiVersion: '<%= @global_config['FACEBOOK_API_VERSION'] %>',
         signupEnabled: '<%= @global_config['ENABLE_ACCOUNT_SIGNUP'] %>',
         <% if @global_config['VAPID_PUBLIC_KEY'] %>
         vapidPublicKey: new Uint8Array(<%= Base64.urlsafe_decode64(@global_config['VAPID_PUBLIC_KEY']).bytes %>),