Removes CSS rule causing performance issues (#925)

## Description:
Removes rule from PR #857 that was causing lag issues due to overcalling
of generatestyle().
## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

1brucben

src/client/index.html

@@ -99,11 +99,6 @@
           display: none;
         }
       }
-
-      /* display:none if child has class parent-hidden since we can't use shadow DOM in Lit due to Tailwind */
-      *:has(> .parent-hidden) {
-        display: none;
-      }
     </style>
 
     <!-- Immediate execution to prevent FOUC -->