simplify

src/runtime/internal/dom.ts

@@ -180,12 +180,8 @@ export function set_data(text, data) {
 }
 
 export function set_input_value(input, value) {
-	if (value === null || value === undefined) {
-		value = "";
-	}
-	if (input.value !== value) {
-		input.value = value;
-	}
+	if (value == null) value = '';
+	if (input.value !== value) input.value = value;
 }
 
 export function set_input_type(input, type) {