fix the bug that the native zoom of feature is not properly set when map-meta[name=zoom] does not specify a value

Author: yhy0217

src/map-feature.js

@@ -303,29 +303,7 @@ export class MapFeature extends HTMLElement {
       }
       return { zoom: nativeZoom, cs: nativeCS };
     } else {
-      // feature attaches to layer- or layer-'s shadow
-      if (content.nodeType === Node.DOCUMENT_NODE) {
-        // for features migrated from mapml, read native zoom and cs from the remote mapml
-        return M.getNativeVariables(content);
-      } else if (content.nodeName.toUpperCase() === 'LAYER-') {
-        // for inline features, read native zoom and cs from inline map-meta
-        let zoomMeta = this._parentEl.querySelectorAll('map-meta[name=zoom]'),
-          zoomLength = zoomMeta?.length;
-        nativeZoom = zoomLength
-          ? +zoomMeta[zoomLength - 1]
-              .getAttribute('content')
-              ?.split(',')
-              .find((str) => str.includes('value'))
-              ?.split('=')[1]
-          : 0;
-
-        let csMeta = this._parentEl.querySelectorAll('map-meta[name=cs]'),
-          csLength = csMeta?.length;
-        nativeCS = csLength
-          ? csMeta[csLength - 1].getAttribute('content')
-          : 'gcrs';
-        return { zoom: nativeZoom, cs: nativeCS };
-      }
+      return M.getNativeVariables(content);
     }
   }