snippet: iife, \t removed from first selection

because if we decide to delete first selection then cursor indentation is preserved.

Cursor position after deleting first selection $1
X - Cursor position

before:
```
(function() {
X
}());
```

after:
```
(function() {
  X
}());
```

gif
<img src="http://i.imgur.com/gyVX9wo.gif">