Instead of manually creating (and deleting) a custom image style in your .install file, you should simply implement the hook_image_default_styles() function.
This will not only allow you to remove the .install file altogether, but will also make your custom image style a 'default' - it'll appear on /admin/config/media/image-styles as a default style rather than a custom one, which makes more sense.
Comments
Comment #1
maciej.zgadzaj commentedThanks for pointing this out. Added in the most recent commit.