Refactor the dropin 'is_suitable' method + fix tikwm implementation

Makes it easier to maintain/understand.

src/auto_archiver/modules/generic_extractor/tiktok.py

@@ -1,5 +1,8 @@
 import requests
 from loguru import logger
+
+from yt_dlp.extractor.tiktok import TikTokIE, TikTokLiveIE, TikTokVMIE, TikTokUserIE
+
 from auto_archiver.core import Metadata, Media
 from datetime import datetime, timezone
 from .dropin import GenericDropin
@@ -13,6 +16,11 @@ class Tiktok(GenericDropin):
 
     TIKWM_ENDPOINT = "https://www.tikwm.com/api/?url={url}"
 
+    def suitable(self, url, info_extractor):
+        """This dropin (which uses Tikvm) is suitable for *all* Tiktok type URLs - videos, lives, VMs, and users.
+        Return the 'suitable' method from the TikTokIE class."""
+        return any(extractor().suitable(url) for extractor in (TikTokIE, TikTokLiveIE, TikTokVMIE, TikTokUserIE))
+
     def extract_post(self, url: str, ie_instance):
         logger.debug(f"Using Tikwm API to attempt to download tiktok video from {url=}")