internal/postgres: remove reference to experiments table

Change-Id: I092379b8d9a2b14047bf6eb8fa8cfa84f48b1035
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/262177
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: kokoro <noreply+kokoro@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/internal/postgres/test_helper.go b/internal/postgres/test_helper.go
index 9d64f4a..f49c825 100644
--- a/internal/postgres/test_helper.go
+++ b/internal/postgres/test_helper.go
@@ -104,8 +104,7 @@
 		if _, err := tx.Exec(ctx, `
 			TRUNCATE modules CASCADE;
 			TRUNCATE version_map;
-			TRUNCATE imports_unique;
-			TRUNCATE experiments;`); err != nil {
+			TRUNCATE imports_unique;`); err != nil {
 			return err
 		}
 		if _, err := tx.Exec(ctx, `TRUNCATE module_version_states CASCADE;`); err != nil {