a couple android ui tweaks

android/app/src/main/java/com/mozilla/send/sendandroid/MainActivity.kt

@@ -47,6 +47,9 @@ class MainActivity : AppCompatActivity(), AdvancedWebView.Listener {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
+        // https://developers.google.com/web/tools/chrome-devtools/remote-debugging/webviews
+        WebView.setWebContentsDebuggingEnabled(true); // TODO only dev builds
+
         mWebView = findViewById<WebView>(R.id.webview) as AdvancedWebView
         mWebView!!.setListener(this, this)
         mWebView!!.setWebChromeClient(LoggingWebChromeClient())