rename isIgnoredFile to isPartialFile, remove check of blacklisted files in isPartialFile, correct usage of isPartialFile and isFileBlacklisted

fix for infinite loop causing on files_encryption branch when testing "apps/files_encryption/test/crypt.php" on Method testSymmetricStreamEncryptShortFileContent

Thanks @kabum

$password is not supported

Because there are usually way less folders than files it walks trought the list of all folder quicker, this causes new files to be detected quicker