ci: Add Cargo package ecosystem to Dependabot config (#96)

Configured Dependabot to update Cargo packages weekly.

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: "cargo"
+    directory: "/"
+    schedule:
+      interval: "weekly"

src/gui/draw.rs

@@ -231,7 +231,6 @@ impl SoundpadGui {
                         .to_lowercase()
                         .contains(&search)
             })
-            .cloned()
             .collect();
 
         let available_width = ui.available_width();