"Use an emulator to play this game" not set when importing multi-disc games

[fraganator]

When importing a multi-disc game, the "Use an emulator to play this game" option isn't automatically checked. Any attempt to start the game attempts to open the rom / zip file directly.

Steps to reproduce:

• Drag and drop multi-disc game files to bring up the import wizard (tested with combinations of single disc and multi-disc games, and also only multi-disc games)
• Select the appropriate platform, emulator, and other settings
  • In this case Sony Playstation, ePSXe, use files in current location, and the rest as default
• After the import is complete, the settings for the multi-disc games do not have the "Use an emulator to play this game" checkbox checked under the Emulation tab.
  • The single disc games do have the setting checked.

Tested on:

• Windows 8.1 Pro x64
• LaunchBox 7.6