simplify self function, use this instead of el

Author: Rich-Harris

src/compiler/compile/render_dom/wrappers/shared/add_event_handlers.ts

@@ -10,7 +10,7 @@ export default function add_event_handlers(
 		let snippet = handler.render(block);
 		if (handler.modifiers.has('preventDefault')) snippet = `@prevent_default(${snippet})`;
 		if (handler.modifiers.has('stopPropagation')) snippet = `@stop_propagation(${snippet})`;
-		if (handler.modifiers.has('self')) snippet = `@self(${snippet}, ${target})`;
+		if (handler.modifiers.has('self')) snippet = `@self(${snippet})`;
 
 		const opts = ['passive', 'once', 'capture'].filter(mod => handler.modifiers.has(mod));
 

src/runtime/internal/dom.ts

@@ -73,11 +73,10 @@ export function stop_propagation(fn) {
 	};
 }
 
-export function self(fn, el) {
+export function self(fn) {
 	return function(event) {
-		if(event.target !== el) return;
 		// @ts-ignore
-		return fn.call(this, event);
+		if (event.target === this) fn.call(this, event);
 	};
 }