Enable and fix some more clippy lints (#7426)

One can never have too many lints

crates/egui_demo_app/src/apps/fractal_clock.rs

@@ -73,7 +73,7 @@ impl FractalClock {
             ));
         } else {
             ui.label("The fractal_clock clock is not showing the correct time");
-        };
+        }
         ui.label(format!("Painted line count: {}", self.line_count));
 
         ui.checkbox(&mut self.paused, "Paused");

crates/egui_demo_app/src/apps/image_viewer.rs

@@ -61,7 +61,7 @@ impl eframe::App for ImageViewer {
                     ctx.forget_image(&self.current_uri);
                     self.uri_edit_text = self.uri_edit_text.trim().to_owned();
                     self.current_uri = self.uri_edit_text.clone();
-                };
+                }
 
                 #[cfg(not(target_arch = "wasm32"))]
                 if ui.button("file…").clicked() {

crates/egui_demo_app/src/main.rs

@@ -91,5 +91,5 @@ fn start_puffin_server() {
         Err(err) => {
             log::error!("Failed to start puffin server: {err}");
         }
-    };
+    }
 }