Disable Windows updater BITS

[remusao]

browser/app/profile/firefox.js https://github.com/cliqz-oss/browser-f/blob/master/mozilla-release/browser/app/profile/firefox.js#L169

// If set to true, the Update Service will attempt to use Windows BITS to
// download updates and will fallback to downloading internally if that fails.
// download updates and will fallback to downloading internally if that fails.
// pref("app.update.BITS.enabled", true);
// Cliqz. This looks very experimental, especially a used languages and
// libraries (XPCOM-C++-rust chain). Need to check how winapi-rs really works,
// I didn't find any popular service or project which use it.
// pref("app.update.BITS.enabled", false);

[chrmod]

Guess that's a simpla call to make, let's disable for now.

[sammacbeth]

Looks like we currently have this disabled implicitly as we don't set MOZ_BITS_DOWNLOAD. Do we need to add this explicit disable?

[chrmod]

I don't think we have to touch it now. Moving to backlog