fix: copy cesium.js when rebuildCesium is false

src/index.ts

@@ -84,10 +84,12 @@ function vitePluginCesium(
             path.join(cesiumBuildPath, 'Widgets'),
             path.join(outDir, 'cesium/Widgets')
           );
+          if (!rebuildCesium) {
             await fs.copy(
               path.join(cesiumBuildPath, 'Cesium.js'),
               path.join(outDir, 'cesium/Cesium.js')
             );
+          }
         } catch (err) {
           console.error('copy failed', err);
         }