Fix sound panning so that things on the left fade to the left, and vice versa.
Fix sound panning so that things on the left fade to the left, and vice versa.

bdonlan/openc2e,bdonlan/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,bdonlan/openc2e,ccdevnet/openc2e,bdonlan/openc2e,ccdevnet/openc2e,crystalline/openc2e,crystalline/openc2e,crystalline/openc2e,crystalline/openc2e,ccdevnet/openc2e,ccdevnet/openc2e,crystalline/openc2e