Revert error reporting change committed by mistake

Author: pmclain

lib/internal/Magento/Framework/GraphQl/Query/QueryProcessor.php

@@ -69,7 +69,7 @@ public function process(
             $operationName
         )->toArray(
             $this->exceptionFormatter->shouldShowDetail() ?
-                \GraphQL\Error\Debug::INCLUDE_DEBUG_MESSAGE : true
+                \GraphQL\Error\Debug::INCLUDE_DEBUG_MESSAGE : false
         );
     }
 }