deploy/build.yaml: fix gendb invocation

The flags to gendb have changed. Omit the -report flag;
the default is what we want.

Change-Id: I304807573576d5d3fc3914ee43205ffca5e04bd5
Reviewed-on: https://go-review.googlesource.com/c/vulndb/+/377675
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Damien Neil <dneil@google.com>
diff --git a/deploy/build.yaml b/deploy/build.yaml
index 991c0ae..600cc3b 100644
--- a/deploy/build.yaml
+++ b/deploy/build.yaml
@@ -2,7 +2,7 @@
   - name: golang
     entrypoint: bash
     args: ["-c", "go install golang.org/x/vulndb/cmd/gendb@latest
-                  && gendb -reports reports -out /workspace/db"]
+                  && gendb -out /workspace/db"]
   - name: gcr.io/cloud-builders/gsutil
     entrypoint: bash
     args: ["./deploy/gcp-deploy.sh"]