Up default camera LED duty cycle

BlobDetector's current thresholds weren't happy even ~3-4m away from
target.

Change-Id: I3abd86cc6762e023c73bbe92d12fa2511bf37ce8
Signed-off-by: James Kuszmaul <jabukuszmaul+collab@gmail.com>
diff --git a/y2022/vision/camera_reader_main.cc b/y2022/vision/camera_reader_main.cc
index f91b07e..d5ba448 100644
--- a/y2022/vision/camera_reader_main.cc
+++ b/y2022/vision/camera_reader_main.cc
@@ -6,7 +6,7 @@
 // bazel run //y2022/vision:camera_reader -- --config y2022/aos_config.json
 //   --override_hostname pi-7971-1  --ignore_timestamps true
 DEFINE_string(config, "aos_config.json", "Path to the config file to use.");
-DEFINE_double(duty_cycle, 0.25, "Duty cycle of the LEDs");
+DEFINE_double(duty_cycle, 0.5, "Duty cycle of the LEDs");
 DEFINE_uint32(exposure, 5,
               "Exposure time, in 100us increments; 0 implies auto exposure");