[BUG] Broken download of cached file

[FrancisDx]

📝 Describe the Bug

The file cannot be downloaded if it is loaded from the cache.

📖 Library Version

• PDF Viewer Version: [2.1.1]

🚶 Steps to Reproduce

Please follow these steps to reproduce the issue:

1. show pdf from url (PdfViewerActivity.launchPdfFromUrl)
2. show pdf from url (PdfViewerActivity.launchPdfFromUrl) again (so pdf is loaded instantly from cache)
3. Unexpected Behavior: on download icon click, file is not asking for a location, but the "File not downloaded yet" toast is shown.
4. Relevant Code/Stack Trace: Actually the cache path "pdf___cache" is not used, the file is cached to the apps cacheDir.

🤔 Expected Behavior

download from cache as well.

💬 Additional Context

temp workaroud: delete cached pdf before opening PdfViewerActivity:
context?.cacheDir?.listFiles { _, name -> name.endsWith(".pdf") }?.forEach { it.delete() }

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