In the Xray settings update handler, the error from
SetXrayOutboundTestUrl was silently discarded. If the database write
failed, the user received a success toast ("Settings updated
successfully") but the outbound test URL was not actually saved.
Now properly checks the error and returns a failure response to the
user, consistent with how the preceding SaveXraySetting call is
handled.
Qiaochu Hu
81b4ae5661