ffmpeg_wrapper: /platform_decoding/cmd: Update copyright syntax The ffmpeg wrapper's copyright syntax was no longer accepted by the linter. Modifies ffmpeg wrapper copright syntax to meet the linter's requirements. BUG=chromium:1098010 TEST=Code compiles and pre-upload script passes Change-Id: I86adbc2fe3fc2fb40dc48df1803422d4d37e0dba Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/graphics/+/3900833 Commit-Queue: Bijan Choobineh <[email protected]> Tested-by: Bijan Choobineh <[email protected]> Reviewed-by: Nathan Hebert <[email protected]>