fix head duplication with binding present

packages/svelte/src/compiler/compile/render_ssr/index.js

@@ -144,9 +144,13 @@ export default function ssr(component, options) {
 		? b`
 			let $$settled;
 			let $$rendered;
+			let #previous_head = $$result.head;
 
 			do {
 				$$settled = true;
+				// $$result.head is mutated by the literal expression
+				// need to reset it if we're looping back to prevent duplication
+				$$result.head = #previous_head;
 
 				${reactive_declarations}