zfs_get: change time format string from %k to %H

Issue #10090 reported that snapshots created between midnight and 1 AM
are missing a padded zero in the creation property

This change fixes the bug reported in issue #10090 where snapshots
created between midnight and 1 AM were missing a padded zero in the
creation timestamp output.

The leading zero was missing because the time format string used `%k`
which formats the hour as a decimal number from 0 to 23 where single
digits are preceded by blanks[0] and is fixed by changing it to `%H`
which formats the hour as 00-23.

The difference in output is as below

```
-Thu Mar 26  0:39 2020
+Thu Mar 26 00:39 2020
```

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: Igor Kozhukhov <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Signed-off-by: Alex John <[email protected]>
Closes #10090 
Closes #10153 

0 files changed, 0 insertions, 0 deletions