Finish LauncherActivity after browser is started

Finishing the LauncherActivity after starting the browser ensures that
subsequent intents are correctly delivered to the existing session
onNewIntent method.

Author: Serhii Selyvon

androidbrowserhelper/src/main/java/com/google/androidbrowserhelper/trusted/LauncherActivity.java

@@ -243,7 +243,7 @@ protected void launchTwa() {
         mTwaLauncher.launch(twaBuilder,
                 getCustomTabsCallback(),
                 mSplashScreenStrategy,
-                () -> mBrowserWasLaunched = true,
+                () -> {mBrowserWasLaunched = true; finish();},
                 getFallbackStrategy());
 
         if (!sChromeVersionChecked) {