types: fix new types issues (#829)

* feat: add tests for deleting channel overwrites

* fix: typings

src/helpers/templates/delete_guild_template.ts

@@ -1,5 +1,6 @@
 import { rest } from "../../rest/rest.ts";
 import { structures } from "../../structures/mod.ts";
+import { DiscordTemplate } from "../../types/templates/template.ts";
 import { endpoints } from "../../util/constants.ts";
 import { requireBotGuildPermissions } from "../../util/permissions.ts";
 
@@ -16,7 +17,7 @@ export async function deleteGuildTemplate(
   const deletedTemplate = (await rest.runMethod(
     "delete",
     `${endpoints.GUILD_TEMPLATES(guildId)}/${templateCode}`,
-  )) as GuildTemplate;
+  )) as DiscordTemplate;
 
   return structures.createTemplateStruct(deletedTemplate);
 }