move PWA selector code to before profile validation. register shutdown hook when systray launches

Former-commit-id: 770776b088a5c31ac94ede711814b07a94eb2748
Former-commit-id: bf7ed3a10a036a614dd8866ea152cf00fce889f0

src/java/net/i2p/i2pfirefox/I2PBrowser.java

@@ -260,6 +260,12 @@ public class I2PBrowser extends I2PCommonBrowser {
       if (useSystray) {
         logger.info("Starting systray");
         systray(args);
+        Runtime.getRuntime().addShutdownHook(new Thread() {
+          @Override
+          public void run() {
+            shutdownSystray();
+          }
+        });
       }
     } catch (Exception e) {
       logger.warning(e.toString());