Remove brackets around new toctoggle

I82db33d656 in core changes the toggle button of the TOC.
This change removes the brackets around the new toctoggle, too.

Depends-On: I82db33d656b3795d7134a91d20ed9d93a3471086
Change-Id: I7a9fa9f3a630901d736331ecef2c43e3ab918d03

resources/screen-common.less

@@ -485,6 +485,16 @@ ul#filetoc {
 .toctoggle {
 	color: @background3;
 }
+// Remove brackets around the show/hide button of the TOC
+body :not( :checked ) > .toctogglespan:before,
+body :not( :checked ) > .toctogglespan:after {
+	content: '';
+}
+.toctogglelabel {
+	padding-left: 0; // Overwrite label { padding-left: 0.5em; } from forms.less
+	margin-left: 0.5em; // Create new distance to the TOC title without increasing the focus ring
+}
+
 .toc li:last-child {
 	margin-bottom: 0.5em;
 }