core: removal unneeded boolean and finally block from recovery command.

When running reconstruct as internal command, there's no need to the
finally block as exceptions won't be thrown - therefore the finally
block and the used boolean can be removed safely.

Change-Id: I5c14601c1b9f5097c600c0139f785cbe43f4a588
Signed-off-by: Liron Aravot <laravot@redhat.com>