Enable and fix some more clippy lints (#7426)

One can never have too many lints

examples/puffin_profiler/src/main.rs

@@ -177,5 +177,5 @@ fn start_puffin_server() {
         Err(err) => {
             log::error!("Failed to start puffin server: {err}");
         }
-    };
+    }
 }

examples/screenshot/src/main.rs

@@ -57,7 +57,7 @@ impl eframe::App for MyApp {
                             ctx.set_theme(egui::Theme::Dark);
                         } else {
                             ctx.set_theme(egui::Theme::Light);
-                        };
+                        }
                         ctx.send_viewport_cmd(
                             egui::ViewportCommand::Screenshot(Default::default()),
                         );