Fix ntfy upgrade banner in dark mode

[nimbleghost]

No description provided.

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (64ac111) 65.85% compared to head (d838790) 65.85%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #792   +/-   ##
=======================================
  Coverage   65.85%   65.85%           
=======================================
  Files          53       53           
  Lines        7646     7646           
=======================================
  Hits         5035     5035           
  Misses       1775     1775           
  Partials      836      836           

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