build: remove (double) build number from geodns internal version

.goreleaser.yml

@@ -8,7 +8,7 @@ builds:
       - CGO_ENABLED=0
     ldflags:
       - -s -w
-      - -X main.VERSION={{.Version}}{{ if index .Env "DRONE_BUILD_NUMBER" }}-{{ .Env.DRONE_BUILD_NUMBER }}{{ end }}
+      - -X main.VERSION={{.Version}}
       - -X main.gitVersion={{.ShortCommit}}
       - -X main.buildTime={{.Date}}