Fix missing video_in_enabled in vision bot.py for Moondream template

The parameter video_in_enabled=True was missing in DailyParams, which prevented image capture 
from working. Without this parameter, UserImageRequestFrame would be sent but no actual image data would be captured from participants.

This fix enables the "Let me take a look" functionality to work as 
intended by allowing the transport to capture video frames for vision processing with Moondream.

examples/moondream-chatbot/bot.py

@@ -143,6 +143,7 @@ async def main():
             DailyParams(
                 audio_in_enabled=True,
                 audio_out_enabled=True,
+                video_in_enabled=True,
                 video_out_enabled=True,
                 video_out_width=1024,
                 video_out_height=576,