Bug 911055 - [Dialer]DuT doesn allow to dial a <<pause>>

Insert this above where you declare base number so that you don't have to call ``getNumberAsDtmfToneGroups()`` twice:
```javascript
var dtmfToneGroups = getNumberAsDtmfToneGroups(sanitizedNumber);
var baseNumber = dtmfToneGroups[0];
```