lightmode css: fix swagger Authorize dialog

Remove swagger-ui styling that placed white text on a light background in the
Authorize dialog

Signed-off-by: Mike Szczys <mike@golioth.io>

Author: szczys

src/css/custom.css

@@ -103,10 +103,6 @@ button [class^="lightToggleIcon"]:not(:hover) {
   background-color: unset;
 }
 
-.swagger-ui code {
-  color: white;
-}
-
 html[data-theme="dark"] {
   --ifm-color-primary: var(--golioth-color-coral);
   --ifm-color-primary-dark: #d23c43;