Return `AndroidPdfViewer` based on `PDFium`

This PR returns previously used AndroidPdfViewer based on updated PDFium which should no longer have security vulnerabilities previously reported (https://github.com/SimpleMobileTools/Simple-File-Manager/issues/708). Currently there doesn't seem to be any need for further updates in the app or library code other than what was already done in https://github.com/tibbi/PdfiumAndroid/pull/1.

TODO

[x] Wait for https://github.com/tibbi/PdfiumAndroid/pull/1 and update https://github.com/tibbi/AndroidPdfViewer with new ref
[x] Wait for https://github.com/tibbi/AndroidPdfViewer/pull/1 to update ref in dependencies
[x] Restore license for AndroidPdfViewer into https://github.com/SimpleMobileTools/Simple-Commons (https://github.com/SimpleMobileTools/Simple-Commons/pull/1722)
[x] Ensure vulnerability scanner will not complain about this updated version (should not happen, since it is manually checked and pdfium is really updated)