[Refactor] Remove some unnecessary async/await (#2739)

* Remove some unnecessary async/await

* More not-so-async stuff

* More not-so-async stuff

* Fix merge issue

src/Discord.Net.Core/Utils/Cacheable.cs

@@ -47,10 +47,8 @@ namespace Discord
         ///     A task that represents the asynchronous download operation. The task result contains the downloaded
         ///     entity.
         /// </returns>
-        public async Task<TEntity> DownloadAsync()
-        {
-            return await DownloadFunc().ConfigureAwait(false);
-        }
+        public Task<TEntity> DownloadAsync()
+            => DownloadFunc();
 
         /// <summary>
         ///     Returns the cached entity if it exists; otherwise downloads it.
@@ -103,9 +101,9 @@ namespace Discord
         ///     A task that represents the asynchronous download operation. The task result contains the downloaded
         ///     entity.
         /// </returns>
-        public async Task<TDownloadableEntity> DownloadAsync()
+        public Task<TDownloadableEntity> DownloadAsync()
         {
-            return await DownloadFunc().ConfigureAwait(false);
+            return DownloadFunc();
         }
 
         /// <summary>