Add noise_std to hello-wolf sensor YAML files

demos/hello_wolf/yaml/sensor_odom_2d.yaml

@@ -3,3 +3,4 @@
 k_disp_to_disp:   0.1  # m^2   / m
 k_rot_to_rot:     0.1  # rad^2 / rad
 apply_loss_function: true
+noise_std: [1,1]

demos/hello_wolf/yaml/sensor_range_bearing.yaml

@@ -3,3 +3,4 @@
 noise_range_metres_std:     0.1
 noise_bearing_degrees_std:  0.5
 apply_loss_function: true
+noise_std: [1,1]

demos/sensor_odom_3d.yaml

@@ -5,3 +5,4 @@ k_disp_to_rot:    0.02  # rad^2 / m
 k_rot_to_rot:     0.01  # rad^2 / rad
 min_disp_var:     0.01  # m^2
 min_rot_var:      0.01  # rad^2
+noise_std: [1,1]

demos/sensor_odom_3d_HQ.yaml

@@ -5,3 +5,4 @@ k_disp_to_rot:    0.000001  # rad^2 / m
 k_rot_to_rot:     0.000001  # rad^2 / rad
 min_disp_var:     0.00000001  # m^2
 min_rot_var:      0.00000001  # rad^2
+noise_std: [1,1]