cdb: Ignore count uses input as hex

1. Load tests\manual\gdbdebugger\simple\simple.pro from Creator's sources.
2. In main(), uncomment the call to testEndlessLoop().
3. In testEndlessLoop(), place a breakpoint inside the loop.
4. Edit the breakpoint. Set "Ignore count" to 20.
5. Build and run this in debugger.
   When the execution stops, a is 33. It looks like Creator understands the input as hex 20 == dec 32.

Instead, user friendly decimal values should be used.