Enable indent formatting checks even when using --white

In our JavaScript-intensive applications we've included JSLint and most of it's rules as a base for good coding guidelines and syntax.
The major difference is that we stick with tabs instead of spaces.
While there is an option (--white) to allow tabs, this also disables the indentation checks, which we still would like to take advantage of.
We have not noticed any drawbacks of using --white --indent=1 (and this patch) to enable all space and indentation checks since all rows are converted from tabs to spaces before any checks are run anyway.