fix: 解决 upstream 配置报错的问题 (#4438)

Refs https://github.com/1Panel-dev/1Panel/issues/4258

backend/utils/nginx/parser/parser.go

@@ -61,7 +61,7 @@ func NewParserFromLexer(lexer *lexer) *Parser {
 
 	parser.directiveWrappers = map[string]func(*components.Directive) components.IDirective{
 		"server": func(directive *components.Directive) components.IDirective {
-			return parser.wrapServer(directive)
+			return parser.parseUpstreamServer(directive)
 		},
 	}