Fix NLW manifest URL (was canvas, not manifest)

index.html

@@ -633,7 +633,7 @@
                         <option value="">-- Select a sample --</option>
                         <option value="https://digital.library.villanova.edu/Item/vudl:293339/Manifest">Villanova - Dime Novel (32 pages)</option>
                         <option value="https://iiif.wellcomecollection.org/presentation/b18035723">Wellcome - Medical illustrations</option>
-                        <option value="https://damsssl.llgc.org.uk/iiif/2.0/1108344/manifest.json">National Library of Wales</option>
+                        <option value="https://damsssl.llgc.org.uk/iiif/2.0/1108339/manifest.json">National Library of Wales</option>
                         <option value="https://iiif.bodleian.ox.ac.uk/iiif/manifest/e32a277e-91e2-4a6d-8ba6-cc4bad230410.json">Bodleian - Medieval Manuscript</option>
                         <option value="https://iiif.wellcomecollection.org/presentation/b28047345">Wellcome - Insect Transformations (570 pages)</option>
                         <option value="https://www.e-codices.unifr.ch/metadata/iiif/csg-0406/manifest.json">e-codices - Medieval Manuscript (643 pages)</option>