Fix highlight on chat thumbs buttons (microsoft#185063)

The parent element used to also have the 'checked' class, now it doesn't, bisecting to figure out what happened
Fix microsoft/vscode-copilot-release#242

Author: roblourens

src/vs/workbench/contrib/chat/browser/media/chat.css

@@ -82,8 +82,8 @@
 	padding: 2px;
 }
 
-.interactive-item-container .header .monaco-toolbar .checked .action-label,
-.interactive-item-container .header .monaco-toolbar .checked .action-label:hover {
+.interactive-item-container .header .monaco-toolbar .checked.action-label,
+.interactive-item-container .header .monaco-toolbar .checked.action-label:hover {
 	color: var(--vscode-inputOption-activeForeground) !important;
 	border-color: var(--vscode-inputOption-activeBorder);
 	background-color: var(--vscode-inputOption-activeBackground);