EX-4101 lipe: fix stratagem-hp-config.sh typo

EX-4101 lipe: fix stratagem-hp-config.sh typo

In stratagem-hp-config.sh, change is_valid_precent to
is_valid_percent.

Fixes: dcc46813c0c3 ("EX-3890 lipe: raise pool spilling threshold")
Signed-off-by: John L. Hammond <jhammond@whamcloud.com>
Change-Id: Ic0ae2c24238fcf18ee9b6760c0f5c067aaccd84e
Reviewed-on: https://review.whamcloud.com/45307
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Nunez <jnunez@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>