Disk cache: drop frames rendered before adjustment layers blended in their mode (#2618)

#2653 (#2618) changed what an adjustment layer in a mode other than Normal
renders, but its cache keys are unchanged, so frames cached before it keep
showing the Normal result. Bumping the render version keeps old entries
from being reused.

crates/render/src/disk_cache.rs

@@ -841,7 +841,7 @@ fn decode_layer(p: &[u8]) -> Option<Buf> {
 // ---------------------------------------------------------------- content keys
 
 /// Bump when rendering changes in a way that makes old disk entries wrong.
-const RENDER_VERSION: &str = "effectcraft-render-3";
+const RENDER_VERSION: &str = "effectcraft-render-4";
 
 fn hash_debug(h: &mut Hash128, v: &impl std::fmt::Debug) {
     h.write(format!("{v:?}").as_bytes());
@@ -1091,7 +1091,7 @@ mod tests {
         let comp = Comp::new(2, 2, FrameRate::FPS_30, Tick::from_seconds_f64(1.0));
         let id = project.add_item("Cached composition", effectcraft_color::Label::None, None, ItemKind::Comp(comp.into()));
         let key = frame_key(comp_content_key(&project, id), 0, 1000, 0);
-        let previous_key = frame_key(comp_content_key_for_renderer(&project, id, None, "effectcraft-render-2"), 0, 1000, 0);
+        let previous_key = frame_key(comp_content_key_for_renderer(&project, id, None, "effectcraft-render-3"), 0, 1000, 0);
         let dir = tmpdir("previous-renderer");
         {
             let cache = DiskCache::open(&dir, 1 << 30).unwrap();