Enable repair when checking exfat file systems

Merged Mike Fleetwood requested to merge mfleetwo/gparted:exfat-repair into master

Quoting the commit message:

GParted's check operation is a check and if possible repair. For most
file system types GParted already requests that the file system is
repaired. fsck.exfat -y flag has been available since the first release
of exfatprogs 1.0.1 [1] so unconditionally add this.

[1] exfatprogs 1.0.1 fsck/fsck.c:main() case 'y':

Edited by Mike Fleetwood

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