[x/tour] app.yaml: remove GOLANGORG_CHECK_COUNTRY

Nothing in this package or its dependencies uses this variable,
after CL 293449.

Change-Id: I82972cbb7abbeff6c3f4ca757c61ba966b666c19
Reviewed-on: https://go-review.googlesource.com/c/tour/+/295489
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
X-Tour-Commit: 3891a3eb15c053bf644848461c84facbfe1cfb34

tour/app.yaml

diff --git a/tour/app.yaml b/tour/app.yaml
index 9de61cf..3af97ec 100644
--- a/tour/app.yaml
+++ b/tour/app.yaml
@@ -2,7 +2,6 @@
 runtime: go114
 
 env_variables:
-  GOLANGORG_CHECK_COUNTRY: true
   TOUR_ANALYTICS: |
     <script async src="https://www.googletagmanager.com/gtag/js?id=UA-11222381-5"></script>
     <script>