cmd/browser: don't redundantly log the session key

The session key is the same across all requests and not a piece of
information we're really interested in, so don't log it.

Change-Id: Ia2349dd1a7bfa437fc358ee0c96ce7319cbf4994
Reviewed-on: https://upspin-review.googlesource.com/13321
Reviewed-by: Rob Pike <r@golang.org>
diff --git a/cmd/browser/startup.go b/cmd/browser/startup.go
index dae8229..3c99960 100644
--- a/cmd/browser/startup.go
+++ b/cmd/browser/startup.go
@@ -860,6 +860,10 @@
 		if k == "method" {
 			continue
 		}
+		// Don't redundantly log the session key.
+		if k == "key" {
+			continue
+		}
 		if first {
 			fmt.Fprint(&buf, "\n")
 			first = false