Update timber-helper.php
Update timber-helper.php

My Timber-generated pages were failing HTML validation due to some improperly closed standalone tags. This changes those tags to the correct formatting. I left the close slash for backward compatibility with XHTML. There may be other tags, but these were the ones that quickly came to mind.
josephbergdoll/timber,joelgarciajr84/timber,rpkoller/timber,anugupta/timber,lucasmichot/timber,PrisisForks/timber,blocher/timber,blocher/timber,xavierpriour/timber,mgmartel/timber,jnweaver/timber,joelgarciajr84/timber,pensesmart/timber,gbarberi/timber,mojaray2k/timber,anugupta/timber,ogrosko/timber,aprendiendoando/timber,blocher/timber,mgmartel/timber,anugupta/timber,joelgarciajr84/timber,mojaray2k/timber,josephbergdoll/timber,ogrosko/timber,lucasmichot/timber,rpkoller/timber,jarednova/timber,aprendiendoando/timber,jnweaver/timber,jnweaver/timber,xavierpriour/timber,gchtr/timber,gchtr/timber,josephbergdoll/timber,xavivars/timber,rpkoller/timber,gbarberi/timber,jarednova/timber,aprendiendoando/timber,gbarberi/timber,Jmayhak/timber,aaemnnosttv/timber,aaemnnosttv/timber,timber/timber,PrisisForks/timber,mgmartel/timber,xavivars/timber,xavierpriour/timber,gchtr/timber,xavivars/timber,ogrosko/timber,PrisisForks/timber,mojaray2k/timber,pensesmart/timber,lucasmichot/timber,timber/timber,pensesmart/timber,Jmayhak/timber,Jmayhak/timber,aaemnnosttv/timber,jarednova/timber