fix(admin): Use admin-hello first

(#274) (#255)

http/controller/admin/config.go

@@ -78,6 +78,7 @@ func (co *Config) AdminConfig(c *gin.Context) {
 	}
 
 	hello := global.Config.Admin.Hello
+	if hello == "" {
 		helloFile := global.Config.Admin.HelloFile
 		if helloFile != "" {
 			b, err := os.ReadFile(helloFile)
@@ -85,6 +86,7 @@ func (co *Config) AdminConfig(c *gin.Context) {
 				hello = string(b)
 			}
 		}
+	}
 
 	//replace {{username}} to username
 	hello = strings.Replace(hello, "{{username}}", u.Username, -1)