LR-PROF-CAMERACOLOR: bump the render cache version for the new tone fit

Renders change for files with a fitted camera look. Open PRs already claim versions 17, 18 and 19.

crates/engine/src/media.rs

@@ -62,7 +62,7 @@ impl SettingsHashes {
 }
 
 /// Bump when the pipeline's output changes, to invalidate cached thumbnails.
-pub const RENDER_CACHE_VERSION: u64 = 16;
+pub const RENDER_CACHE_VERSION: u64 = 20;
 
 /// Thumbnails render at one of these long edges (so window/cell size changes reuse the cache).
 pub const THUMB_SIZES: [usize; 4] = [128, 256, 384, 512];