backhand: Data duplication flag should be kept from reader

[wcampbell0x2a]

• When using binaries such as add, or mutate the deduplicatin setting should be used that was read from the reader if we can

[github-actions]

Benchmark for 9cba2bb

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Test	Base	PR	%
only_read/netgear_ax6100v2	2.4±0.00ms	2.3±0.01ms	-4.17%
only_read/tplink_ax1800	6.2±0.01ms	6.2±0.02ms	0.00%
unsquashfs/full	10.9±0.24ms	11.0±0.29ms	+0.92%
unsquashfs/full-path-filter	7.6±0.17ms	7.7±0.19ms	+1.32%
unsquashfs/list	7.9±0.16ms	8.0±0.18ms	+1.27%
unsquashfs/list-path-filter	7.1±0.19ms	7.1±0.17ms	0.00%
write_read/netgear_ax6100v2	1281.0±4.02ms	1295.3±13.12ms	+1.12%
write_read/tplink_ax1800	7.1±0.02s	7.2±0.05s	+1.41%

[github-actions]

Benchmark for 87b6b9f

Click to view benchmark

Test	Base	PR	%
only_read/netgear_ax6100v2	2.3±0.00ms	2.3±0.00ms	0.00%
only_read/tplink_ax1800	6.2±0.01ms	6.2±0.01ms	0.00%
unsquashfs/full	10.9±0.20ms	11.0±0.25ms	+0.92%
unsquashfs/full-path-filter	7.6±0.09ms	7.6±0.12ms	0.00%
unsquashfs/list	8.0±0.15ms	7.9±0.07ms	-1.25%
unsquashfs/list-path-filter	7.0±0.05ms	7.0±0.06ms	0.00%
write_read/netgear_ax6100v2	1269.7±2.85ms	1277.7±5.09ms	+0.63%
write_read/tplink_ax1800	7.0±0.02s	7.0±0.01s	0.00%