Fix `when` indentation error when use tabs

When use `js2coffee -it` that use tab to indents, the `when` command in `switch` not use tab but use normal spaces. This commit fixed it.

However, after use `// OPTIONS: {"indent": "\t"}` in newly added test file, the other test files run later will fail because indent option is stored and not reset. So I changed default test options to include `indent`.