Set cell number for CH with 077 078 or 079 as prefix

For cell number in Switzerland, only the following values are valid:
`077`, `078` or `079`

So the generation of cell number must like this:
```
var prefix= ['077', '078', '079'];
include(inc, 'cell', '(' + randomItem(prefix) + ')-' + random(3, 3) + '-' + random(3, 4));
```