(re-)introduce template literal support in JSmin.php (see https://wor…

…dpress.org/support/topic/crash-plugin-if-use-not-paired-quoutes and mrclay/jsmin-php#7)

classes/external/php/jsmin.php

@@ -196,7 +196,7 @@ protected function action($command)
                 // fallthrough intentional
             case self::ACTION_DELETE_A: // 2
                 $this->a = $this->b;
-                if ($this->a === "'" || $this->a === '"') { // string literal
+                if ($this->a === "'" || $this->a === '"'|| $this->a === '`') { // string/template literal
                     $str = $this->a; // in case needed for exception
                     for(;;) {
                         $this->output .= $this->a;