No simple UI detection.

Author: blazoncek

wled00/data/settings_ui.htm

@@ -43,6 +43,7 @@
 			}
 		};
 		function gId(s) { return d.getElementById(s); }
+		function toggle(el) { gId(el).classList.toggle("hide"); gId('No'+el).classList.toggle("hide"); }
 		function isObject(item) {
 			return (item && typeof item === 'object' && !Array.isArray(item));
 		}
@@ -247,7 +248,10 @@
 		<h2>Web Setup</h2>
 		Server description: <input type="text" name="DS" maxlength="32"><br>
 		Sync button toggles both send and receive: <input type="checkbox" name="ST"><br>
-		Enable simplified UI: <input type="checkbox" name="SU"><br>
+		<div id="NoSimple" class="hide">
+			<em style="color:#fa0;">This firmware build does not include simplified UI support.<br></em>
+		</div>
+		<div id="Simple">Enable simplified UI: <input type="checkbox" name="SU"><br></div>
 		<i>The following UI customization settings are unique both to the WLED device and this browser.<br>
 		You will need to set them again if using a different browser, device or WLED IP address.<br>
 		Refresh the main UI to apply changes.</i><br>