Fix typo in API model for GameAssets

This would cause the large asset's Image ID (and in turn, Image URL) and
hover text to be reversed.

src/Discord.Net.Rest/API/Common/GameAssets.cs

@@ -1,4 +1,4 @@
-using Newtonsoft.Json;
+using Newtonsoft.Json;
 
 namespace Discord.API
 {
@@ -8,9 +8,9 @@ namespace Discord.API
         public Optional<string> SmallText { get; set; }
         [JsonProperty("small_image")]
         public Optional<string> SmallImage { get; set; }
-        [JsonProperty("large_image")]
-        public Optional<string> LargeText { get; set; }
         [JsonProperty("large_text")]
+        public Optional<string> LargeText { get; set; }
+        [JsonProperty("large_image")]
         public Optional<string> LargeImage { get; set; }
     }
-}
+}