Fixes `RayCasterCamera` demo in headless mode (#266)

# Description

This MR fixes `RayCasterCamera` demo where initialization failed in
headless mode. It also remove a print statement within the `Se2GamePad`

## Type of change

- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./orbit.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [x] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

source/extensions/omni.isaac.orbit/omni/isaac/orbit/devices/gamepad/se2_gamepad.py

@@ -145,7 +145,6 @@ class Se2Gamepad(DeviceBase):
         cur_val = event.value
         if abs(cur_val) < self.dead_zone:
             cur_val = 0
-        print(event)
         # -- left and right stick
         if event.input in self._INPUT_STICK_VALUE_MAPPING:
             direction, axis, value = self._INPUT_STICK_VALUE_MAPPING[event.input]

source/standalone/demo/play_ray_caster_camera.py

@@ -101,7 +101,7 @@ def main():
     rep_writer = rep.BasicWriter(output_dir=output_dir, frame_padding=3)
 
     # Play simulator
-    sim.play()
+    sim.reset()
 
     # Set pose: There are two ways to set the pose of the camera.
     # -- Option-1: Set pose using view