Fix logs header in light theme in Container Logs

[p0358]

Changes:
The text here is unreadable in the white theme:

It was due to color: #fff being on parent .logs-wrapper instead of actual child .logs element where it's needed to counteract the black background of terminal window.

Testing:
Use light theme and ensure text after header is readable and not white. The logs output should still be white on black.

Downstream

nothing?

Please backport this to the upcoming 24.10.0 too.

[bvasilenko]

Looks good

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.56%. Comparing base (17fb4d7) to head (2fa023b).
Report is 9 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #10850   +/-   ##
=======================================
  Coverage   81.56%   81.56%           
=======================================
  Files        1586     1586           
  Lines       54129    54129           
  Branches     5803     5803           
=======================================
  Hits        44153    44153           
  Misses       9976     9976           

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