fix: always treat server_user as an admin

src/service/admin/mod.rs

@@ -406,6 +406,10 @@ pub async fn get_admins(&self) -> Vec<OwnedUserId> {
 
 	/// Checks whether a given user is an admin of this server
 	pub async fn user_is_admin(&self, user_id: &UserId) -> bool {
+		if self.services.globals.server_user == user_id {
+			return true
+		}
+
 		if self
 			.services
 			.server