Persist Area positions again (#4749)

* Reverts https://github.com/emilk/egui/pull/4577

We again persist area positions, but not sizes.

crates/eframe/src/web/web_logger.rs

@@ -38,6 +38,8 @@ impl log::Log for WebLogger {
     }
 
     fn log(&self, record: &log::Record<'_>) {
+        #![allow(clippy::match_same_arms)]
+
         if !self.enabled(record.metadata()) {
             return;
         }