fix pass user-agent (#138)

* fix pass user-agent

* Revert "fix pass user-agent"

This reverts commit 76ac58e.

* Revert "Revert "fix pass user-agent""

This reverts commit a6b2bd0.

* tune agent

client.go

@@ -309,12 +309,10 @@ func (c *APIClient) authMethod() AuthMethod {
 func (c *APIClient) makeHeaders(ctx context.Context) (http.Header, error) {
 	headers := http.Header{}
 	headers.Set(WarehouseRoute, "warehouse")
+	headers.Set(UserAgent, fmt.Sprintf("databend-go/%s", version))
 	if userAgent, ok := ctx.Value(ContextUserAgentID).(string); ok {
-		headers.Set(UserAgent, fmt.Sprintf("%s/databend-go/%s", version, userAgent))
-	} else {
-		headers.Set(UserAgent, fmt.Sprintf("databend-go/%s", version))
+		headers.Set(UserAgent, fmt.Sprintf("databend-go/%s/%s", version, userAgent))
 	}
-	headers.Set(UserAgent, fmt.Sprintf("databend-go/%s", version))
 	if c.tenant != "" {
 		headers.Set(DatabendTenantHeader, c.tenant)
 	}