refactor: Only show unknown commands in debug

There are a bunch of optional commands provided by druid that trigger
this, but we only really need it to check for custom ones that weren't
implemented, yet.

crates/dtmm/src/state.rs

@@ -390,7 +390,9 @@ impl AppDelegate<State> for Delegate {
                 Handled::Yes
             }
             cmd => {
+                if cfg!(debug_assertions) {
                     tracing::warn!("Unknown command: {:?}", cmd);
+                }
                 Handled::No
             }
         }