feat: add 3:2 to valid aspect ratio list

Author: lulzsun

Classes/Utils/Helpers.cs

@@ -702,7 +702,7 @@ public static string GetAspectRatio(int width, int height) {
         }
 
         public static bool IsValidAspectRatio(int width, int height) {
-            return new[] { "64:27", "43:18", "21:9", "16:10", "16:9", "4:3", "32:9" }.Contains(GetAspectRatio(width, height));
+            return new[] { "64:27", "43:18", "21:9", "16:10", "16:9", "4:3", "32:9", "3:2" }.Contains(GetAspectRatio(width, height));
         }
 
         public static IEnumerable<(T item, int index)> WithIndex<T>(this IEnumerable<T> source) {