Fix flake8 errors in dap/server.py

Commit 032d23a6 ("Fix stray KeyboardInterrupt after cancel")
introduced some errors into dap/server.py.  A function is called but
not imported, and the wrong variable name is used.  This patch
corrects both errors.

Approved-By: Simon Marchi <simon.marchi@efficios.com>


1 file changed