undo removal of ssrHtml value

it was equal to html but to restored to keep diff smaller

test/runtime/samples/binding-input-checkbox-deep-contextual-b/_config.js

@@ -11,6 +11,18 @@ export default {
 		</div>
 	`,
 
+	ssrHtml: `
+		<div>
+			<input type="checkbox"><p>one</p>
+		</div>
+		<div>
+			<input type="checkbox"><p>two</p>
+		</div>
+		<div>
+			<input type="checkbox"><p>three</p>
+		</div>
+	`,
+
 	async test({ assert, component, target, window }) {
 		const inputs = [ ...target.querySelectorAll('input') ];