Debugger: Fix setting of some disabled breakpoints

As we disable of 'by-address' breakpoints by default after each
debugger run as they are unlikely to be correct on the next run,
starting with disabled breakpoints might happen. Disabling it
immediately is faster and less racy than relying on the 'change
needed' mechanism.

Change-Id: Icc5548d322f7ef4f099d218b4f04b4c40e3cb850
Reviewed-by: David Schulz <david.schulz@digia.com>