ssh1: Fix typo in service batch file

The typo prevented the use of a history file.

Target: trunk
Request: 2.8
Request: 2.7
Require-notes: yes
Require-book: no
Acked-by: Paul Millar <paul.millar@desy.de>
Patch: http://rb.dcache.org/r/6697/
(cherry picked from commit 465705ba177ac75bfc247f4798778d3d2e631edd)
Merge pull request #455 from gbehrmann/fix/2.7/rb6697

ssh1: Fix typo in service batch file