fix(GuildChannel): account for everyone base permissions (#11053)

When calculating permissions after overwrites, the base permission of the at-everyone role need to be accounted for.
Role#permissions is not sufficient, as it only describes base permissions of the role itself.

fixes #11052

Author: almostSouji

packages/discord.js/src/structures/GuildChannel.js

@@ -263,10 +263,11 @@ class GuildChannel extends BaseChannel {
       return new PermissionsBitField(PermissionsBitField.All).freeze();
     }
 
+    const basePermissions = new PermissionsBitField([role.permissions, role.guild.roles.everyone.permissions]);
     const everyoneOverwrites = this.permissionOverwrites.cache.get(this.guild.id);
     const roleOverwrites = this.permissionOverwrites.cache.get(role.id);
 
-    return role.permissions
+    return basePermissions
       .remove(everyoneOverwrites?.deny ?? PermissionsBitField.DefaultBit)
       .add(everyoneOverwrites?.allow ?? PermissionsBitField.DefaultBit)
       .remove(roleOverwrites?.deny ?? PermissionsBitField.DefaultBit)