Reduce gamepad CPU usage on Steam Link

- Gamepad sensors are now disabled by default
- Added a small deadzone to limit excess gamepad input reports

app/deploy/steamlink/moonlight.sh

@@ -9,6 +9,11 @@ HOME=/usr/local/moonlight
 # https://github.com/moonlight-stream/moonlight-qt/issues/697
 export SDL_ENABLE_STEAM_CONTROLLERS=1
 
+# Disable gamepad sensors by default to avoid excessive CPU
+# usage that can cause audio glitches. Remove the following
+# line to enable gamepad sensors.
+export SENSOR_REPORT_RATE_LIMIT_HZ=0
+
 # Renice PE_Single_CPU which seems to host A/V stuff
 renice -10 -p $(pidof PE_Single_CPU)