fix: use getAttribute instead of .value

packages/svelte/src/internal/client/dom/elements/attributes.js

@@ -16,10 +16,12 @@ import * as w from '../../warnings.js';
  */
 export function remove_input_attr_defaults(dom) {
 	if (hydrating) {
-		const value = dom.value;
+		// using getAttribute instead of dome.value allow us to have
+		// null instead of "on" if the user didn't set a value
+		const value = dom.getAttribute('value');
 		set_attribute(dom, 'value', null);
 		set_attribute(dom, 'checked', null);
-		dom.value = value;
+		if (value) dom.value = value;
 	}
 }