tests: subsys: dfu: Remove nrf52 scratch

Removes deleting the nRF52840 scratch partition from tests as
this has now been removed.

Signed-off-by: Jamie McCrae <[email protected]>

Author: nordicjm

tests/subsys/dfu/mcuboot_multi/nrf52840dk_nrf52840.overlay

@@ -5,7 +5,6 @@
  */
 
 
-/delete-node/ &scratch_partition;
 /delete-node/ &storage_partition;
 /delete-node/ &slot0_partition;
 /delete-node/ &slot1_partition;