drive: preserve mime type on file update - fixes #417
drive: preserve mime type on file update - fixes #417

seuffert/rclone,yonjah/rclone,seuffert/rclone,B4dM4n/rclone,arcimboldo/rclone,jackschmidt/rclone,B4dM4n/rclone,arcimboldo/rclone,seuffert/rclone,jackschmidt/rclone,ncw/rclone,kynikos/rclone,olihey/rclone,yonjah/rclone,jackschmidt/rclone,yonjah/rclone,ncw/rclone,arcimboldo/rclone,kynikos/rclone,B4dM4n/rclone,B4dM4n/rclone,arcimboldo/rclone,olihey/rclone,olihey/rclone,ncw/rclone,kynikos/rclone,seuffert/rclone,kynikos/rclone,olihey/rclone,jackschmidt/rclone,yonjah/rclone,ncw/rclone