support object listener on removeEventListener also

src/browser/dom/event_target.zig

@@ -114,7 +114,7 @@ pub const EventTarget = struct {
     pub fn _removeEventListener(
         self: *parser.EventTarget,
         typ: []const u8,
-        cbk: Env.Function,
+        listener: EventHandler.Listener,
         opts_: ?RemoveEventListenerOpts,
     ) !void {
         var capture = false;
@@ -125,6 +125,8 @@ pub const EventTarget = struct {
             };
         }
 
+        const cbk = (try listener.callback(self)) orelse return;
+
         // check if event target has already this listener
         const lst = try parser.eventTargetHasListener(
             self,
@@ -266,5 +268,9 @@ test "Browser.DOM.EventTarget" {
         .{ "content.addEventListener('he', obj1);", null },
         .{ "content.dispatchEvent(new Event('he'));", null },
         .{ "obj1.calls", "1" },
+
+        .{ "content.removeEventListener('he', obj1);", null },
+        .{ "content.dispatchEvent(new Event('he'));", null },
+        .{ "obj1.calls", "1" },
     }, .{});
 }