fix: Correctly remove child elements with integrated UI remove (#1219)

Author: 1natsu172

Diff for: packages/wxt/src/client/content-scripts/ui/index.ts

@@ -34,6 +34,7 @@ export function createIntegratedUi<TMounted>(
   };
   const remove = () => {
     options.onRemove?.(mounted);
+    wrapper.replaceChildren();
     wrapper.remove();
     mounted = undefined;
   };