#9 The engine does not auto-run 'main.gam'

[Delano]

If a game file named 'main.gam' exists, trans3 should load it, instead of presenting the user with the select file dialog (as in 3.0.6). To reproduce:

1. Rename any .gam file in the Toolkit3/main/ folder to 'main.gam'.
2. Run trans3.exe. 'main.gam' should run automatically.