Fix syntax error in METADATA updater

The edit I made in the update-from-external script deletes the double
quotation around the version field which makes the METADATA file
unparseable.

Bug: 386801050
Test: ./update-from-external.sh 8.13.55 && cd ../.. && m
Change-Id: I514e39c0325eff16f5918f9be5bc5e72b494e76e
1 file changed