Normalize is-tiled-image attribute string to boolean. (#325)

HTML attributes are always strings, so "false" is
always being treated as "truthy." This causes the web
component to always fetch info.json in tiled image mode.
Instead, this change explicitly compares against true/"true"
to correctly handle all attribute values.

Author: markpbaggett

src/web-components/clover-image.tsx

@@ -35,7 +35,13 @@ const CloverImageWebComponent: FC<
     }
   }, [props, props.__registerPublicApi]);
 
-  return <Image label={ariaLabel} isTiledImage={isTiledImage} src={src} />;
+  return (
+    <Image
+      label={ariaLabel}
+      isTiledImage={isTiledImage === true || isTiledImage === "true"}
+      src={src}
+    />
+  );
 };
 
 const cloverViewerWCProps = ["aria-label", "src", "is-tiled-image"];