fix: duplicate danmaku filename when fallback

Author: Tony15246

api.lua

@@ -491,8 +491,9 @@ function get_danmaku_fallback(query)
 
     local url = options.fallback_server .. "/?url=" .. query
     msg.verbose("尝试获取弹幕：" .. url)
-    local temp_file = "danmaku-" .. pid .. ".xml"
+    local temp_file = "danmaku-" .. pid .. danmaku.count .. ".xml"
     local danmaku_xml = utils.join_path(danmaku_path, temp_file)
+    danmaku.count = danmaku.count + 1
     local arg = {
         "curl",
         "-L",