correct typo in bulge effect file name

Change-Id: Ief8f5df1cd49562dc63d787fa9e9a1a9e8dc71cf
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/548697
Auto-Submit: Jorge Betancourt <jmbetancourt@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
Reviewed-by: John Stiles <johnstiles@google.com>
4 files changed