fix: hide "add a tool call"

src/editMessageString.tsx

@@ -79,8 +79,6 @@ export function EditMessageString({
               </button>
             </span>
             <hr className="my-2" />
-          </div>
-        ))}
             <span className="flex flex-col my-2 justify-between">
               <button
                 className="bg-blue-300 text-black p-1 rounded"
@@ -101,6 +99,8 @@ export function EditMessageString({
                 {Tr("Add a tool call")}
               </button>
             </span>
+          </div>
+        ))}
       <textarea
         className="rounded border border-gray-400 w-full h-32 my-2"
         value={chat.content}