fix(RemoteFile): Don't try to delete unavailable S3 file

[cogk]

If I'm not mistaken, unavailable Remote Files could be removed (like other Log Types) once they become unavailable.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 29.94%. Comparing base (2f435f8) to head (b6b667a).

Files with missing lines	Patch %	Lines
press/press/doctype/remote_file/remote_file.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2259      +/-   ##
==========================================
- Coverage   29.94%   29.94%   -0.01%     
==========================================
  Files         371      371              
  Lines       28078    28079       +1     
==========================================
  Hits         8408     8408              
- Misses      19670    19671       +1     

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