Fix .NET enum template name

Author: abnegate

templates/dotnet/src/Appwrite/Enums/Enums.cs.twig renamed to templates/dotnet/src/Appwrite/Enums/Enum.cs.twig

@@ -11,9 +11,9 @@ namespace {{ spec.title | caseUcfirst }}.Enums
             Value = value;
         }
 
-{% for value in enum.enum %}
-{% set key = enum.keys is empty ? value : enum.keys[loop.index0] %}
+        {%~ for value in enum.enum %}
+        {%~ set key = enum.keys is empty ? value : enum.keys[loop.index0] %}
         public static {{ enum.name | caseUcfirst | overrideIdentifier }} {{ key | caseUcfirst | strip }} => new {{ enum.name | caseUcfirst | overrideIdentifier }}("{{ value }}");
-{% endfor %}
+        {%~ endfor %}
     }
 }