fix: second tool call is empty for gpt-5

Author: uinstinct

gui/src/redux/slices/sessionSlice.ts

@@ -598,7 +598,6 @@ export const sessionSlice = createSlice({
               },
               contextItems: [],
             };
-            handleToolCallsInMessage(message, historyItem);
             state.history.push(historyItem);
             lastItem = state.history[state.history.length - 1];
             lastMessage = lastItem.message;