Fix video file name.

Change-Id: Id1ff1196fa8072cc90d1a3921846687687b180b4

Author: MarkDaoust

Diff for: samples/count_tokens.py

@@ -156,7 +156,7 @@ def test_tokens_multimodal_video_audio_file_api(self):
         model = genai.GenerativeModel("models/gemini-1.5-flash")
 
         prompt = "Tell me about this video"
-        your_file = genai.upload_file(path=media / "VideoTrim.mp4")
+        your_file = genai.upload_file(path=media / "Big_Buck_Bunny.mp4")
 
         # Videos need to be processed before you can use them.
         while your_file.state.name == "PROCESSING":