fix incorrect log driver in podman container image

Commit 7f2c27d added an invalid value for the log_driver in the
containers.conf file inside the podman image.

Fixes #10312

Signed-off-by: Paul Holzinger <paul.holzinger@web.de>

contrib/podmanimage/stable/containers.conf

@@ -5,7 +5,7 @@ ipcns="host"
 utsns="host"
 cgroupns="host"
 cgroups="disabled"
-log_driver = "k8s_file"
+log_driver = "k8s-file"
 [engine]
 cgroup_manager = "cgroupfs"
 events_logger="file"