[screen test] Put test into production

With this change, the test becomes blocking, run in terminal-x64-release.

This test has been very stable.

Bug: INTK-1096

Change-Id: Id5937a6128ca5fdaf15bedbcbe0f27aa75ed6a0e
diff --git a/src/tests/screen_is_not_black/BUILD.gn b/src/tests/screen_is_not_black/BUILD.gn
index d0a11e9..a687c96 100644
--- a/src/tests/screen_is_not_black/BUILD.gn
+++ b/src/tests/screen_is_not_black/BUILD.gn
@@ -26,8 +26,11 @@
     if (!defined(env.tags)) {
       env.tags = []
     }
-    env.tags += [ "e2e-terminal" ]
-    environments += [ env ]
+    # This test is in production for x64 builds alone.
+    if (current_cpu != "x64") {
+      env.tags += ["e2e-terminal"]
+    }
+    environments += [env]
   }
 }