Par-check shouldn't ignore files from ExtCleanupDisk

[hugbug]

Par-checker has a nice feature to ignore files which users doesn't need anyway. This allows to avoid lengthy par-repair when no important files are damaged. For example if only nfo-files are damaged but all rar-files are OK the repair can be skipped.

To configure the list of files to ignore there is option ParIgnoreExt. Historically par-checker also ignores files listed in option ExtCleanupDisk. This may lead to confusion when users mistakenly put "rar" in option ExtCleanupDisk (cleaning up of rar-files is controlled by option UnpackCleanupDisk).

To avoid confusion the par-check should ignore only files listed in ParIgnoreExt. If users want to ignore files listed in ExtCleanupDisk too it's always possible to add these files to option ParIgnoreExt.