Fix modified timestamp for chunk upload

Description

For chunk upload we sent the timestamp from SyncedFileState which is defined in milli second while NextCloud excepts an Unix Timestamp in second. This patch provides the modified file date like it is done in uploadFile operation to be consistent.

Ref: https://gitlab.e.foundation/e/backlog/-/issues/6784

Screenshots

Technical details

Tests

• on device setup a murena account with some picture in Photos directory
• find a file greater than 3MB

  adb shell "find /storage/emulated/0/DCIM -type f -size +3MB"

• update the file

  adb shell "echo test >>  filepath"

• chunk upload is used to push the file on the cloud

  file	folder

• update edrive apk with the fix
• update the file again

  adb shell "echo test2 >>  filepath"

• chunk upload is used to push the file on the cloud

  file	folder

Issues

https://gitlab.e.foundation/e/backlog/-/issues/6784

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