prism js: fix file name typo Change-Id: I5e4cdbc8babb18d5e0cfde37675a9b30093fffa1 Reviewed-on: https://chromium-review.googlesource.com/c/external/github.com/WebKit/JetStream/+/7036461 Reviewed-by: Marja Hölttä <marja@chromium.org>