update scheme mode to work with new tokenizer

lib/ace/mode/_test/tokens_scheme.json

@@ -2,7 +2,8 @@
    "start",
   ["text","("],
   ["storage.type.function-type.scheme","define"],
-  ["text"," ("],
+  ["text"," "],
+  ["text","("],
   ["identifier","prompt-for-cd"],
   ["text",")"]
 ],[

lib/ace/mode/scheme_highlight_rules.js

@@ -67,7 +67,7 @@ var SchemeHighlightRules = function() {
             "regex": "(?:\\b(?:(define|define-syntax|define-macro))\\b)(\\s+)((?:\\w|\\-|\\!|\\?)*)"
         },
         {
-            "token": ["punctuation.definition.constant.character.scheme", "constant.character.scheme"],
+            "token": "punctuation.definition.constant.character.scheme",
             "regex": "#:\\S+"
         },
         {