delete_breakpoint: don't try to insert other breakpoints

[Vladimir Prus]

The delete_breakpoint function tries to check if the
breakpoint being deleted is inserted in inferior, and if
so, searched for breakpoints that are set at the same address
and tries to insert them.  However, GDB removes breakpoint
from the inferior immediately when inferior is stopped,
so this code will never run.  Removing this code has
no effect on test results. 

(And generally, if that function needed to insert breakpoints,
it should have used insert_breakpoints, instead of duplicating
the logic somewhat).

OK?

- Volodya



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