[CLI] Formatting issue in some DEBUG output

[sobotka]

Formatting of some DEBUG output appears flawed.

  // Handle failure to find decoder
  if (codec == nullptr) {
    Error(QStringLiteral("Failed to find appropriate decoder for this codec (%1 :: %2)")
          .arg(stream()->footage()->filename(), avstream_->codecpar->codec_id));
    return false;
  }

Outputs the following incorrect output via the %2:

[WARNING] "Failed to find appropriate decoder for this codec (/home/aphorism/Downloads/Footage/Fuji-X-T3-Footage-DSCF0666.MOV :: %2)" ((null):0)