Only accepted features should be included in the download data

[omranlm]

Describe the bug
In the mapping page, only accepted features should be included in the download .. or clearly declare that the download would include all predicated features

To Reproduce
Steps to reproduce the behavior:

1. Go to mapping page, for example https://fair-dev.hotosm.org/start-mapping/120
2. Click on run prediction
3. Scroll down see the download as geojson button under options section
4. Download the data and visualize it in QGIS and it will include all features

Expected behavior
We should have the selected features only downloaded
Another option is to clearly say it is downloading all data

Screenshots

[omranlm]

CC @kshitijrajsharma