MiniKonohaGrammar fix

Now forrowing code works.
```
MiniKonohaGrammar MiniKonohaGrammar = new MiniKonohaGrammar();
Konoha KonohaContext = new Konoha(MiniKonohaGrammar, LeafJSCodeGen.class.getName());
KonohaContext.Eval(
    "int fibo(int n) {\n" + 
    "    if(n < 3){ return 1; }\n" + 
    "    else{ return fibo(n-1)+fibo(n-2); }\n" + 
    "}", 1000);
```
result in:
```
var fibo = function(n) {
    if(n < 3) {
        return 1;
    } else {
        return fibo(n - 1) + fibo(n - 2);
    };
};
```