[Settings] Avoid from close dialog when touch outside.

Roaming confirmation dialog might get closed when touch outside,
which is easily been triggered when having a large screen.

Solution: avoid from close dialog when touch outside of dialog area.

Bug: 235183999
Test: local
Change-Id: Ic312d80e6f04cb8f323ebc713eef4e15257de358

src/com/android/settings/network/telephony/RoamingDialogFragment.java

@@ -72,7 +72,9 @@ public class RoamingDialogFragment extends InstrumentedDialogFragment implements
                 .setIconAttribute(android.R.attr.alertDialogIcon)
                 .setPositiveButton(android.R.string.yes, this)
                 .setNegativeButton(android.R.string.no, this);
-        return builder.create();
+        AlertDialog dialog = builder.create();
+        dialog.setCanceledOnTouchOutside(false);
+        return dialog;
     }
 
     @Override