Bug in decoding function if 0 is present

When a zero value is in the array the output is not working anymore. Only the numbers before the 0 will be returned.

```
$ bash bashids -e 775 0 504316 15237 1 7 6 3 25174 1
An3UyFx9xyaxJes1hvCGtAHB1wh9
$ bash bashids -d An3UyFx9xyaxJes1hvCGtAHB1wh9
775
```
