Ignore the EventSource() errors

We have code checking for the presence of this, so it's OK to ignore these errors.

Signed-off-by: XhmikosR <xhmikosr@gmail.com>

scripts/pi-hole/js/gravity.js

@@ -17,6 +17,7 @@ function eventsource() {
     return;
   }
 
+  // eslint-disable-next-line compat/compat
   var source = new EventSource("scripts/pi-hole/php/gravity.sh.php");
 
   ta.html("");