Update IsHCPExplicitelyEnabled logic

internal/registry/env/env.go

@@ -47,6 +47,6 @@ func IsHCPDisabled() bool {
 
 // IsHCPExplicitelyEnabled returns true if the client enabled HCP_PACKER_REGISTRY explicitely, i.e. it is defined and not 0 or off
 func IsHCPExplicitelyEnabled() bool {
-	hcp, ok := os.LookupEnv(HCPPackerRegistry)
-	return ok && strings.ToLower(hcp) != "off" && hcp != "0"
+	_, ok := os.LookupEnv(HCPPackerRegistry)
+	return ok && !IsHCPDisabled()
 }