fix(misconf): get user from Config.User

[DmitriyLewen]

Description

Possible cases when History doesn't contain information about user.
Config.User can contain user information:

➜  ~ docker image inspect alpine | jq '.[].Config.User'
""
➜  ~ docker history alpine          
IMAGE          CREATED        CREATED BY                                      SIZE      COMMENT
5053b247d78b   7 months ago   /bin/sh -c #(nop)  CMD ["/bin/sh"]              0B        
<missing>      7 months ago   /bin/sh -c #(nop) ADD file:289c2fac17119508c…   7.66MB    
➜  ~ docker run --user 1003 alpine
➜  ~ docker ps -a          
CONTAINER ID   IMAGE     COMMAND     CREATED          STATUS                      PORTS     NAMES
bcbf97a115a5   alpine    "/bin/sh"   28 seconds ago   Exited (0) 27 seconds ago             focused_fermat
➜  ~ docker commit bcbf97a115a5 alpine:test-user
sha256:04babd6fbc5d383e83019b5e3d5a9c37f50158f7f0a3cc19a7d6546ea562dc4d
➜  ~ docker image inspect alpine:test-user | jq '.[].Config.User'
"1003"
➜  ~ docker history alpine:test-user
IMAGE          CREATED          CREATED BY                                      SIZE      COMMENT
04babd6fbc5d   23 seconds ago   /bin/sh                                         0B        
5053b247d78b   7 months ago     /bin/sh -c #(nop)  CMD ["/bin/sh"]              0B        
<missing>      7 months ago     /bin/sh -c #(nop) ADD file:289c2fac17119508c…   7.66MB 

➜  ~ docker run -it --rm alpine:test-user
~ $ whoami
whoami: unknown uid 1003
~ $ id -u -n
1003id: unknown ID 1003

Checklist

• I've read the guidelines for contributing to this repository.
• I've followed the conventions in the PR title.
• I've added tests that prove my fix is effective or that my feature works.
• I've updated the documentation with the relevant information (if needed).
• I've added usage information (if the PR introduces new options)
• I've included a "before" and "after" example to the description (if the PR is a user interface change).