add missing loop return during image unpacking

It was a harmless bug, rest of zip entries didn't pass the name filter.

src/frontend/source.ts

@@ -448,6 +448,7 @@ async function unpackFactoryImage(factoryImagePath: string, image: DeviceImage,
       await fs.rename(unpackedTmp, out)
 
       console.log('unpacked ' + getUnpackedFactoryDirName(image))
+      return
     }
   } finally {
     await fd.close()