Recreate the patch file instead of only truncating it, on failed HTTP downloads

Dependencies

• [2] 4CEHBW7Y Truncate files when restarting a HTTP transfer
• [3] TPEH2XNB 1.0.0-alpha.28, with Tokio 1.0
• [4] IQ4FCHPZ HTTP connections: pooling + retry on error
• [*] FBXYP7QM Forgot to add remote::http
• [*] VBMXB443 Retrying if the HTTP connection drops while reading the body

Change contents

• edit in pijul/src/remote/http.rs at line 37
  [2.73]

  [3.1132]
  + f = std::fs::File::create(&path_)?;
• edit in pijul/src/remote/http.rs at line 39
  [3.1213]→[2.74:101](∅→∅)
  − f.set_len(0)?;
• edit in pijul/src/remote/http.rs at line 55
  [7.593]

  [3.1262]
  + f = std::fs::File::create(&path_)?;