change accountSwitcher.js to always use SSL

Move all accountSwitcher login requests to HTTPS and stop using ssl.reddit.com.

(fixes account switcher for Chrome incognito)

Formerly accountSwitcher.js used an unsecured request to www.reddit.com to log in when in Chrome incognito mode, as ssl.reddit.com cookies were not allowed. Now that reddit supports HTTPS site-wide, that call is blocked (as it should be) and unnecessary, as plain reddit.com can be accessed via HTTPS.

See https://www.reddit.com/r/RESissues/comments/2gcsi1/bug_account_switcher_loads_nonhttps_api_login/