This bug turned out to pop up wherever a table existed in both
'settings' and 'organization settings', notably *excluding* both
'Custom Emoji' and 'Authentication Methods'.
The first thought to the solution was to simply add `thead` to the css
rule that applies the appropiate color for headers and the like. This
was successful, however it brought attention to a sub-problem:
`emoji-settings-admin` and `auth-mehtod-settings-admin` were both
creating table headers in the body of the table. This was causing the
rows in these two tables to be colored inversely from all the others.
This is also the reason why these tables are the only ones correctly
styled. These handlebars were updated with the headers moved out of the
body.
The even and odd rows of the tables were then colored appropriately.
Fixes: #12209
820dd3a946