Highlight the "Admin" menu when selected

Thanks @treepleks

Author: Luc

esp8266/data/header.inc

@@ -17,14 +17,14 @@ $INCLUDE[css.inc]$
 	<td class="$MENU_PRINTER$"><a href="http://$WEB_ADDRESS$/PRINTER">3D Printer</a></td>
 	<td class="$MENU_SETTINGS$"><a href="http://$WEB_ADDRESS$/SETTINGS">Extra Settings</a></td>
 	<td width=100%>&nbsp;</td>
-	<td><a href="/PASSWORD" style="$DISCONNECT_VISIBILITY$">Admin</a></td>
+	<td class="$MENU_ADMIN$"><a href="/PASSWORD" style="$DISCONNECT_VISIBILITY$">Admin</a></td>
 	<td style="padding:0px;"><a href="/LOGIN?DISCONNECT=YES"><div class="btnroundimg" style="$DISCONNECT_VISIBILITY$"><svg width="30" height="30" viewBox="0 0 40 40">
 	<circle style="fill:white"  cx="20"  cy="20"  r="20"/> 
 	<circle style="fill:white;stroke:black;stroke-width:4" cx="20" cy="15" r="10"/>
     <rect  style="fill:black;stroke-width:4;stroke:black" width="20" height="15" x="10" y="17" />
     <circle style="fill:white" cx="20" cy="22" r="2.5"/>
     <polygon points="20,23 16,30 24,30" style="fill:white"/></svg></div></a></td>
 	<td>FW:  V$FW_VER$</td>
-	<td><a href="https://github.com/luc-github/ESP8266" >Github</a></td>
+	<td><a href="https://github.com/luc-github/ESP8266">Github</a></td>
 </tr>
 </table>