hud-pinning.js: use absolute positioning

js/hud-pinning.js

@@ -25,7 +25,7 @@ $(document).ready(function() {
 
 	if (window.Options && Options.get_tab('general') && window.jQuery) {
 		function setHudPinning(pin) {
-			let style = pin ? '' : 'initial';
+			let style = pin ? '' : 'absolute';
 			$('#top-hud').css('position', style);
 			$('#bottom-hud').css('position', style);
 		}