skqp/.../assets/.gitignore: remove important things

Change-Id: Iabe82a2404d4119b1464a62729fdc04ee0b0e765
Reviewed-on: https://skia-review.googlesource.com/c/165309
Reviewed-by: Hal Canary <halcanary@google.com>
Commit-Queue: Hal Canary <halcanary@google.com>
1 file changed