drive: remove part of workaround for #1675
drive: remove part of workaround for #1675

Now that https://issuetracker.google.com/issues/64468406 has been
fixed, we can remove part of the workaround which fixed #1675 -
019adc35609c2136

This will make queries marginally more efficient.  We still need the
other part of the workaround since the `=` operator is case
insensitive.

olihey/rclone,B4dM4n/rclone,yonjah/rclone,B4dM4n/rclone,B4dM4n/rclone,ncw/rclone,olihey/rclone,olihey/rclone,yonjah/rclone,B4dM4n/rclone,yonjah/rclone,olihey/rclone,ncw/rclone,ncw/rclone,yonjah/rclone,ncw/rclone