android: Fix import of an already existing VPN profile

src/frontends/android/app/src/main/java/org/strongswan/android/ui/VpnProfileImportActivity.java

@@ -676,6 +676,7 @@ public class VpnProfileImportActivity extends AppCompatActivity
 			if (mExisting != null)
 			{
 				mProfile.setUUID(mExisting.getUUID());
+				mProfile.setDataSource(mExisting.getDataSource());
 				mDataSource.updateVpnProfile(mProfile);
 			}
 			else