install.php needs some style

[dd32]

As part of the CSS shakeup, we lost a few table styling items for the installer.

See attached screenshot of 3.2 and 3.3 side by side, the latter looks a lot less polished IMO, The Bold black row labels stand out particularly.

The database credentials screen in setup-config.php could also do with the same table styles.

See also #17975 #18866

[SergeyBiryukov]

Related: ticket:18576:10

[nacin]

I've found that the new style is sharp and polished. After five months, how do we still feel about this?

[lessbloat]

I love ya Dion ;-), but I also prefer the newer (less boxy) style.