Closes #867.

TSInterfaceBody handling in printer.ts adds additional semicolons when recast.print is used. This produces not working and not parsable code. Anyways, prettyPrint works good, it do not look at source, and try to guess that semicolons is needed, but it's internal method that no one use.

This PR removes additional semicolons, and keeps code parsable for both cases: prettyPrint and print.
So internal from source code:

interface Hello {
    hello: any;
}

prettyPrint will produce:

 interface Hello {
    hello: any
}

And print will produce:

 interface Hello {
    hello: any;
}