Adjusted recordings' file names for Windows compatability

[Tail870]

Made $timestamp compatable with Windows - in Nextcloud this adjusted with these lines in config.php:

  'forbidden_filename_characters' =>
  array (
    0 => '<',
    1 => '>',
    2 => ':',
    3 => '"',
    4 => '|',
    5 => '?',
    6 => '*',
    7 => '\\',
    8 => '/',
  ),

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