getFormSettings() for appType 'general' was missing proxy fields
(proxy_enabled, proxy_type, proxy_hostname, proxy_port, proxy_username,
proxy_password, proxy_ignored_addresses) and other newer fields
(show_nzb_hunt_on_home, tmdb_image_cache_days, web_server_threads).
The setupSettingsManualSave in general.js calls getFormSettings() which
was never updated when proxy UI was added. Added all missing fields.
148af7be8a