fix x-fb-x2pagent-request-id header logging

Summary: This is a fix of copypasted preceding line when the logging for this column was being added.

Reviewed By: YousefSalama

Differential Revision: D66881116

fbshipit-source-id: 7043298789ee135ee21588f7a147432d782316d1

eden/mononoke/gotham_ext/src/middleware/scuba.rs

@@ -130,7 +130,7 @@ impl AsRef<str> for HttpScubaKey {
             ConfigStoreLastUpdatedAt => "config_store_last_updated_at",
             XFBProductLog => "x_fb_product_log",
             XFBProductLogInfo => "x_fb_product_log_info",
-            XFBX2PAgentRequestId => "x_fb_product_log_info",
+            XFBX2PAgentRequestId => "x_fb_x2pagent_request_id",
             XFBGitWrapper => "git_wrapper",
             XFBNetworkType => "fb_network_type",
         }