Incorrect orientation format in examples/objects/load_objects.py

[sanghongrui]

Hi,
As shown in examples/objects/load_objects.py #L91-L104 :

iGibson/igibson/examples/objects/load_objects.py

Lines 91 to 104 in 7d95982

	# Objects to load: two tables, the first one is predefined model, the second, random for the same category
	table_objects_to_load = {
	"table_1": {
	"category": "breakfast_table",
	"model": "1b4e6f9dd22a8c628ef9d976af675b86",
	"pos": (0.0, -0.2, 1.01),
	"orn": (0, 0, 90),
	},
	"table_2": {
	"category": "breakfast_table",
	"pos": (0.5, -2.0, 1.01),
	"orn": (0, 0, 45),
	},
	}

the ori attribute for objects is defined in degree format and transform to quatation using quat_from_euler. However, it is based on p.getQuaternionFromEuler, which needs rad angle format.
Although the codes can normally run, this could cause some misunderstandings.