Small style updates to admin approve screen

[adevade]

• Better alignment for avatar and username.
• Left align actions, and add WP button styles.

[adevade]

After I submitted this PR I saw that this page was deprecated. However, it's only minor changes to the inline CSS so I guess it can't hurt.

Preview

From this

To this

• Username better aligned with the rest of the text in the row.
• WordPress style buttons for "Approve" and "Deny" links.

[picklewagon]

Thanks for this. That page will go away someday. I just haven't decided when. When there are lots of users, it is unusable.