lava-submit.jpl: Fix Groovy insecure string interpolation warning

Should not interpolate on Groovy level, instead should do that on shell
level.

Signed-off-by: Paul Sokolovsky <paul.sokolovsky@linaro.org>
Change-Id: Ib8e680aee665f53ae76ed767e2a78e2e44d918f6
1 file changed