Refactor: curve password text and small change

Curve password text around the circle instead of straight dots
Cleared text is displayed on top of the circle instead of in the middle

src/lock.rs

@@ -120,7 +120,7 @@ impl LockedSurface {
         }
 
         self.renderer
-            .set_password_display(self.input_handler.get_display_password());
+            .set_password_display(self.input_handler.password_length());
         self.renderer.render();
     }