fix: missing shim

Author: imorland

js/src/@types/shims.d.ts

@@ -26,5 +26,18 @@ declare module 'flarum/tags/admin/components/EditTagModal' {
   export default interface EditTagModal {
     richExcerpts: Stream<boolean>;
     excerptLength: Stream<number>;
+    submitData(): {
+      excerptLength: any;
+      richExcerpts: any;
+      name: string;
+      slug: string;
+      description: string;
+      color: string;
+      icon: string;
+      isHidden: boolean;
+      primary: boolean;
+      richExcerpts: boolean;
+      excerptLength: number;
+    };
   }
 }