tools/livepatch: Show the correct expected state before action

tools/livepatch: Show the correct expected state before action

Somewhat confusingly, before the action has been executed the patch is
expected to be in the "allow" state, not the "expected" state.  The
check for this was correct but the subsequent error message was not.
Fix the error message to show this state correctly.

Before:
    $ xen-livepatch unload test
    test: in wrong state (APPLIED), expected (unknown)
After:
    $ xen-livepatch unload test
    test: in wrong state (APPLIED), expected (CHECKED)

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Acked-by: Wei Liu <wei.liu2@citrix.com>
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>