CI: Run cargo clippy for wasm32-unknown-unknown (#2200)

* CI: Run cargo clippy for wasm32-unknown-unknown

* wasm32 clippy fixes

* Document when AppRunner::new can fail

crates/eframe/src/web/web_painter_glow.rs

@@ -72,7 +72,7 @@ impl WebPainter for WebPainterGlow {
     }
 
     fn destroy(&mut self) {
-        self.painter.destroy()
+        self.painter.destroy();
     }
 }