go.mod: delete repeated "indirect"

It got added by 'go mod tidy' in CL 471399
because the '; ' separator was missing.

For golang/go#48523.
For golang/go#58737.

Change-Id: I63642a4f49beb9679f9c5bbb4e2aa8ed0cc73c9e
Reviewed-on: https://go-review.googlesource.com/c/text/+/501835
TryBot-Result: Gopher Robot <gobot@golang.org>
Auto-Submit: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Run-TryBot: Dmitri Shuralyov <dmitshur@golang.org>

go.mod

diff --git a/go.mod b/go.mod
index 50f5d66..8915bd1 100644
--- a/go.mod
+++ b/go.mod
@@ -3,8 +3,8 @@
 require golang.org/x/tools v0.6.0 // tagx:ignore
 
 require (
-	golang.org/x/mod v0.8.0 // indirect; indirect tagx:ignore
-	golang.org/x/sys v0.5.0 // indirect; indirect tagx:ignore
+	golang.org/x/mod v0.8.0 // indirect; tagx:ignore
+	golang.org/x/sys v0.5.0 // indirect; tagx:ignore
 )
 
 go 1.17