st/oxr: Add hydra pose to "suitable pose name" list

Part-of: <https://gitlab.freedesktop.org/monado/monado/-/merge_requests/2469>

src/xrt/state_trackers/oxr/oxr_xdev.c

@@ -57,6 +57,7 @@ find_suitable_pose_name(struct xrt_device *xdev)
 		case XRT_INPUT_PICO_NEO3_GRIP_POSE: return name;
 		case XRT_INPUT_PICO4_GRIP_POSE: return name;
 		case XRT_INPUT_OPPO_MR_GRIP_POSE: return name;
+		case XRT_INPUT_HYDRA_POSE: return name;
 		default: break;
 		}
 	}