vendor.mod: remove outdated comment about replaced module

The replace was removed in 64f9ea1cf5179718e11a89412341f3eb4781cab9, but I
forgot to remove the comment.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
(cherry picked from commit 6326ad172972de505ed478369fa9457522174d48)
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

vendor.mod

@@ -117,7 +117,7 @@ require (
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/google/btree v1.1.2 // indirect
-	github.com/google/certificate-transparency-go v1.1.4 // indirect; replaced; see "replace" section at the bottom of this file for the actual version.
+	github.com/google/certificate-transparency-go v1.1.4 // indirect
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510 // indirect
 	github.com/googleapis/enterprise-certificate-proxy v0.1.0 // indirect
 	github.com/googleapis/gax-go/v2 v2.4.0 // indirect