.jshintrc

cmdutil: add a missing byte prefix to string introduce in 976b26bdd0d8

The change is missing a the `b'foo'` prefix to make it a bytestring. This lead
to a traceback in some third party extension. It is unclear to me why the
Mercurial test pass without it.

Differential Revision: https://phab.mercurial-scm.org/D9974

{
    // Enforcing
    "eqeqeq"        : true,     // true: Require triple equals (===) for comparison
    "forin"         : true,     // true: Require filtering for..in loops with obj.hasOwnProperty()
    "freeze"        : true,     // true: prohibits overwriting prototypes of native objects such as Array, Date etc.
    "nonbsp"        : true,     // true: Prohibit "non-breaking whitespace" characters.
    "undef"         : true,     // true: Require all non-global variables to be declared (prevents global leaks)

    // Environments
    "browser"       : true      // Web Browser (window, document, etc)
}