rm duplication in api spec letter types

Author: alexnuttall

infrastructure/terraform/modules/backend-api/spec.tmpl.json

@@ -758,8 +758,7 @@
           {
             "type": "object",
             "required": [
-              "files",
-              "templateType"
+              "files"
             ],
             "properties": {
               "files": {
@@ -770,12 +769,6 @@
                 "items": {
                   "type": "string"
                 }
-              },
-              "templateType": {
-                "type": "string",
-                "enum": [
-                  "LETTER"
-                ]
               }
             }
           }

lambdas/backend-client/src/types/generated/types.gen.ts

@@ -85,7 +85,6 @@ export type CreateLetterProperties = {
 export type LetterProperties = CreateLetterProperties & {
   files: LetterFiles;
   personalisationParameters?: Array<string>;
-  templateType: 'LETTER';
 };
 
 export type BaseTemplate = {