.jshintrc

share: rename share-safe warning config

Config introduced in previous patch was `share.source-safe-mismatch`. Let's
rename the warn as `share.source-safe-mismatch.warn`.

While we are here, made sure we have different configs for upgrade and
downgrade.

Differential Revision: https://phab.mercurial-scm.org/D9786

{
    // 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)
}