[AmountOfMoney] Utterances that match the pattern `<number> $ <number>` return the wrong amount

The following requests replicate the issue the latest pull of `master`:

* `i have two $ 500 checks`
```
[
{
"body":"two $ 500",
"start":7,
"value": {"value":7,"type":"value","unit":"$"},
"end":16,
"dim":"amount-of-money",
"latent":false
}
]
```
* `a $ 100`
```
[
{
"body":"a $ 100",
"start":0,
"value":{"value":2,"type":"value","unit":"$"},
"end":7,
"dim":"amount-of-money",
"latent":false
}
]
```