[coffeescript mode] Remove disabled code

Removed possible testing and unreachable code to avoid JavaScript
compiler errors:

...
codemirror/mode/coffeescript/coffeescript.js:271: WARNING - unreachable code
    if (false && current === ".") {
...

mode/coffeescript/coffeescript.js

@@ -267,17 +267,6 @@ CodeMirror.defineMode("coffeescript", function(conf, parserConf) {
     var style = state.tokenize(stream, state);
     var current = stream.current();
 
-    // Handle "." connected identifiers
-    if (false && current === ".") {
-      style = state.tokenize(stream, state);
-      current = stream.current();
-      if (/^\.[\w$]+$/.test(current)) {
-        return "variable";
-      } else {
-        return ERRORCLASS;
-      }
-    }
-
     // Handle scope changes.
     if (current === "return") {
       state.dedent = true;