tiktok & soundcloud: proper best audio picking

also improved tiktok audio file naming scheme. full audio now has the "_audio_original" tag. audio extracted from video is simply "_audio".

src/modules/processing/servicesConfig.json

@@ -57,7 +57,6 @@
             "alias": "tiktok videos, photos & audio",
             "patterns": [":user/video/:postId", ":id", "t/:id", ":user/photo/:postId"],
             "subdomains": ["vt", "vm"],
-            "audioFormats": ["best", "m4a", "mp3"],
             "enabled": true
         },
         "douyin": {
@@ -74,7 +73,6 @@
         "soundcloud": {
             "patterns": [":author/:song/s-:accessKey", ":author/:song", ":shortLink"],
             "subdomains": ["on", "m"],
-            "audioFormats": ["best", "opus", "mp3"],
             "enabled": true
         },
         "instagram": {