Bug: Printing if statement inside bracketless if-else

This
```
recast.print(
b.ifStatement(
b.literal(1), // test
b.ifStatement( // consequent
b.literal(2), // - test
b.expressionStatement(b.literal(3)) // - consequent
),
b.expressionStatement(b.literal(4)) // alternate
)
).code
```
produces:
```
if (1)
if (2)
3;
else
4;
```
but should produce this:
```
if (1)
{
if (2)
3;
} else
4;
```

Start with the provided recast.print and b.ifStatement reproduction, comparing the actual output with the expected braced if-else form. Done means the nested if statement prints with braces so the else binds to the intended outer statement, with the reproduction serving as the regression check.

Written by the indexing model from the issue text.