🐛 fix: Revert "Enable googleSearch Tool for gemini-2.0-flash-exp (lob…

…ehub#4997)" (lobehub#5003)

This reverts commit cde0d1a.

src/libs/agent-runtime/google/index.ts

@@ -91,12 +91,7 @@ export class LobeGoogleAI implements LobeRuntimeAI {
         .generateContentStream({
           contents,
           systemInstruction: payload.system as string,
-          tools: (() => {
-            if (!payload.tools && model.startsWith('gemini-2.0')) {
-              return [{ googleSearch: {} } as GoogleFunctionCallTool];
-            }
-            return this.buildGoogleTools(payload.tools);
-          })(),
+          tools: this.buildGoogleTools(payload.tools),
         });
 
       const googleStream = convertIterableToStream(geminiStreamResult.stream);