PONTIANAK, Indonesia, Sept 16 (Reuters) — Indonesian housewife Mimi Marlina rode a motorbike through thickening haze blanketing the city of Pontianak on Borneo island, making a foray to buy groceries and supplies as the Southeast Asian nation battles raging forest fires. “We can still hold it off with medicines, but I’m concerned that if this persists, it will lead to worse illnesses,”…