rtt: use NGLI_TEXTURE_USAGE_TRANSIENT_ATTACHMENT_BIT where appropriate
rtt: use NGLI_TEXTURE_USAGE_TRANSIENT_ATTACHMENT_BIT where appropriate

gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl,gopro/gopro-lib-node.gl