Fix static call in TraceableTwigTemplate
Fix static call in TraceableTwigTemplate

Cannot call $this in static method. See #164
reignHay/debugbar,reignHay/debugbar,maximebf/php-debugbar,maximebf/php-debugbar,DanPhyxius/php-debugbar,Big-Shark/php-debugbar,reignHay/debugbar,Big-Shark/php-debugbar,stefandoorn/php-debugbar,stefandoorn/php-debugbar,Big-Shark/php-debugbar,stefandoorn/php-debugbar,getgrav/php-debugbar,stefandoorn/php-debugbar,getgrav/php-debugbar,DanPhyxius/php-debugbar,PatidarWeb/php-debugbar,reignHay/debugbar,DanPhyxius/php-debugbar,getgrav/php-debugbar,DanPhyxius/php-debugbar,PatidarWeb/php-debugbar,PatidarWeb/php-debugbar,maximebf/php-debugbar,Big-Shark/php-debugbar