Revert #9554 Refactor stylesheets in single <style> tags

These changes break the palette switcher

core/ui/RootStylesheet.tid

@@ -1,13 +0,0 @@
-title: $:/core/ui/RootStylesheet
-code-body: yes
-
-\import [subfilter{$:/core/config/GlobalImportFilter}]
-\whitespace trim
-<$let currentTiddler={{$:/language}} languageTitle={{!!name}}>
-	<$list filter="[all[shadows+tiddlers]tag[$:/tags/Stylesheet]!is[draft]]">
-		<style type="text/css">
-			<$text text={{{ [<currentTiddler>addprefix[/* ]addsuffix[ */]] }}}/>
-			<$transclude $tiddler=<<currentTiddler>> $output="text/plain" $mode="block"/>
-		</style>
-	</$list>
-</$let>