Remove CurrentUser.country.

This was Cloudflare-specific and it was only used for selecting the
currency during user upgrades.

app/logical/session_loader.rb

@@ -58,9 +58,9 @@ class SessionLoader
   # resetting a password from an magic email link)
   #
   # Also performs post-load actions, including updating the user's last login
-  # timestamp, their last used IP, their timezone, their database timeout, their
-  # country, whether safe mode is enabled, their session cookie, and unbanning
-  # banned users if their ban is expired.
+  # timestamp, their last used IP, their timezone, their database timeout,
+  # whether safe mode is enabled, their session cookie, and unbanning banned
+  # users if their ban is expired.
   #
   # @see ApplicationController#set_current_user
   # @see CurrentUser
@@ -79,7 +79,6 @@ class SessionLoader
     update_last_logged_in_at
     update_last_ip_addr
     set_time_zone
-    set_country
     set_safe_mode
     set_save_data_mode
     initialize_session_cookies
@@ -168,12 +167,6 @@ class SessionLoader
     Time.zone = CurrentUser.user.time_zone
   end
 
-  # Depends on Cloudflare
-  # https://support.cloudflare.com/hc/en-us/articles/200168236-Configuring-Cloudflare-IP-Geolocation
-  def set_country
-    CurrentUser.country = request.headers["CF-IPCountry"]
-  end
-
   def set_safe_mode
     safe_mode = request.host.in?(Danbooru.config.safe_mode_hostnames) || params[:safe_mode].to_s.truthy? || CurrentUser.user.enable_safe_mode?
     CurrentUser.safe_mode = safe_mode