Update CacheUpdate for GuildUpdateEvent (#3370)

`Guild` has since welcomed new fields, but they weren't reflected in
`GuildUpdateEvent`'s `CacheUpdate` implementation afterwards.

Fixes #3364, and a bunch of other fields.

Author: GnomedDev

src/cache/event.rs

@@ -309,21 +309,32 @@ impl CacheUpdate for GuildUpdateEvent {
         if let Some(mut guild) = cache.guilds.get_mut(&self.guild.id) {
             guild.afk_metadata.clone_from(&self.guild.afk_metadata);
             guild.banner.clone_from(&self.guild.banner);
+            guild.description.clone_from(&self.guild.description);
             guild.discovery_splash.clone_from(&self.guild.discovery_splash);
+            guild.emojis.clone_from(&self.guild.emojis);
             guild.features.clone_from(&self.guild.features);
             guild.icon.clone_from(&self.guild.icon);
+            guild.icon_hash.clone_from(&self.guild.icon_hash);
             guild.name.clone_from(&self.guild.name);
             guild.owner_id.clone_from(&self.guild.owner_id);
+            guild.preferred_locale.clone_from(&self.guild.preferred_locale);
             guild.roles.clone_from(&self.guild.roles);
             guild.splash.clone_from(&self.guild.splash);
+            guild.stickers.clone_from(&self.guild.stickers);
             guild.vanity_url_code.clone_from(&self.guild.vanity_url_code);
             guild.welcome_screen.clone_from(&self.guild.welcome_screen);
+            guild.application_id = self.guild.application_id;
+            guild.approximate_member_count = self.guild.approximate_member_count;
+            guild.approximate_presence_count = self.guild.approximate_presence_count;
             guild.default_message_notifications = self.guild.default_message_notifications;
+            guild.explicit_content_filter = self.guild.explicit_content_filter;
             guild.max_members = self.guild.max_members;
             guild.max_presences = self.guild.max_presences;
             guild.max_video_channel_users = self.guild.max_video_channel_users;
+            guild.max_stage_video_channel_users = self.guild.max_stage_video_channel_users;
             guild.mfa_level = self.guild.mfa_level;
             guild.nsfw_level = self.guild.nsfw_level;
+            guild.premium_progress_bar_enabled = self.guild.premium_progress_bar_enabled;
             guild.premium_subscription_count = self.guild.premium_subscription_count;
             guild.premium_tier = self.guild.premium_tier;
             guild.public_updates_channel_id = self.guild.public_updates_channel_id;