Appearance: zbus follows eframe's version instead of an exact pin (#519 follow-up)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QiAJeFttZp83Fh7YuzAR5f

apps/effectcraft/Cargo.toml

@@ -23,8 +23,8 @@ log = { workspace = true }
 
 [target.'cfg(target_os = "linux")'.dependencies]
 # Settings ▸ Appearance ▸ Sync with System: the XDG desktop portal's colour scheme. Already in
-# Cargo.lock (accesskit, through eframe); pinned exactly to the same version.
-zbus = "=5.19.0"
+# Cargo.lock (accesskit, through eframe), so it adds no new crates.
+zbus = "5.19"
 
 [build-dependencies]
 # Icon + VERSIONINFO for effectcraft.exe; build.rs only uses it when targeting Windows.