Fix error after single quote semantics change

grammar_parser.meta

@@ -199,7 +199,7 @@ CharacterClass.match(stream, context, actions) {
                 success = 1;
             }
 
-        } else if (prevChar != nil && self.value[i] == ord('-')) {
+        } else if (prevChar != nil && self.value[i] == '-') {
 
             // [a-z] case
             if (i+1 < classLength) {
@@ -225,7 +225,7 @@ CharacterClass.match(stream, context, actions) {
             }
 
         // [ab] case
-        } else if (prevChar != nil && self.value[i] != ord('-')) {
+        } else if (prevChar != nil && self.value[i] != '-') {
             // println("[ab] case");
             prevChar = self.value[i];
             if (stream.peek() == self.value[i]) {