No debugger set, manage button disabled, in autodetected kit

Similar to Bug 10463

The Difference is that in the 3.0.0 Beta version:

1. On the debugger tab, I could manually select the auto-detected debugger then press apply.
2. Back on the kits tab I select the auto-detected kit.
3. The Drop down list would be enabled and I could select /usr/bin/dbg.
4. The exclamation icon would disappear.
5. This condition would remain until QtCreator was shut down and restarted.

In the 3.0.0 release version:

1. On the debugger tab, I manually select the auto-detected debugger then press apply.
2. Back on the kits tab I Select the auto-detected kit.
3. The Drop down list would NOT be enabled So I could not select the debugger that was auto-detected.

Ernie D