file_delete() now takes file ID as parameter, not a file object

As part of the conversion of files to classed entities, changes were made to file_delete().

• The function now takes a file ID as a parameter
• The $forced parameter has been removed
• The function no longer returns a value

Examples

// D7 code
$deleted = file_delete($file, TRUE));

// Backdrop 1.0.0 code
$fid = $file->fid;
file_delete($fid); // No return value

Or alternatively, since the file object is now an entity
$file->delete(); // No return value