Film Negative messes with non-raws

[Paul Matthijsse]

Hello, I just noticed that when using the Film Negative tool on non-raw files, the resulting negative image can’t be undone by disabling the filter, it stays negative. Setting Processing Profiles to Neutral or Default doesn’t change anything. Going back in the History panel or using previous snapshots: no change. Only solution is to close the file, then say in File browser via right-click Proc. Prof. operations > Reset to default, and reopen the original image. (In RT this filter is in the Raw tab btw).

[agriggio]

fixed refresh of film negative for non-raw images

Fixes #65

→ <<cset 2f7598645c9e>>