[ruff_wasm] Remove semicolon after TypeScript interface definition

This removes a trailing semicolon after an interface definition in
the custom TypeScript section.  Currently, this semicolon triggers
the error "TS1036: Statements are not allowed in ambient contexts".

crates/ruff_wasm/src/lib.rs

@@ -53,7 +53,7 @@ export interface Diagnostic {
             };
         }[];
     } | null;
-};
+}
 "#;
 
 #[derive(Serialize, Deserialize, Eq, PartialEq, Debug)]