[gegl] tests: update tests using boats.png image

[Øyvind "pippin" Kolås <ok src gnome org>]

commit ebebccc4fe6713f59b8060448e88334913c6c89c
Author: Øyvind Kolås <pippin gimp org>
Date:   Wed Jul 11 15:56:21 2018 +0200

    tests: update tests using boats.png image
    
    The PNG file doesn't contain an sRGB chunk and it does dontain a gAMA chunk
    meaning the gamma value should be obeyed and the image not treated as sRGB.

 tests/compositions/reference/lens-flare.png       | Bin 327275 -> 456322 bytes
 tests/compositions/reference/stretch-contrast.png | Bin 2921 -> 2994 bytes
 2 files changed, 0 insertions(+), 0 deletions(-)
---
diff --git a/tests/compositions/reference/lens-flare.png b/tests/compositions/reference/lens-flare.png
index ede5a9de4..5c7d83ad7 100644
Binary files a/tests/compositions/reference/lens-flare.png and b/tests/compositions/reference/lens-flare.png 
differ
diff --git a/tests/compositions/reference/stretch-contrast.png 
b/tests/compositions/reference/stretch-contrast.png
index 29cd231be..b9f6dffbb 100644
Binary files a/tests/compositions/reference/stretch-contrast.png and 
b/tests/compositions/reference/stretch-contrast.png differ