Fix search dropdown items text color on hover (#4632)

themes/tiddlywiki/vanilla/base.tid

@@ -1594,7 +1594,7 @@ html body.tc-body.tc-single-tiddler-window {
 	color: <<colour muted-foreground>>;
 }
 
-.tc-block-dropdown a:hover {
+.tc-block-dropdown a.tc-tiddlylink:hover {
 	color: <<colour tiddler-link-background>>;
 	background-color: <<colour tiddler-link-foreground>>;
 	text-decoration: none;