findmissing: remove redundant '%'

https://crrev.com/c/2128681 added a redundant '%' in the time format
string.  Remove it.

BUG=b:223717399
TEST=./scripts/gce/full_sync_and_patch_create.sh

Change-Id: I86388dd9581c94cd5ff955ab96d2aabf801412d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/dev-util/+/3944769
Commit-Queue: Tzung-Bi Shih <tzungbi@chromium.org>
Tested-by: Tzung-Bi Shih <tzungbi@chromium.org>
Reviewed-by: Guenter Roeck <groeck@chromium.org>
1 file changed