gdb/dap: allow some requests when the process is running

It is impossible to set a breakpoint when the process is running,
which I find annoying. LLDB does not have this restriction. I made
`setBreakpoints` and `breakpointLocations` work when the process is
running. Probably more requests can be changed, but I only need these
two at the moment.

Approved-By: Tom Tromey <tom@tromey.com>
2 files changed