Fix up previous edebug breakpoint overlay change

* lisp/emacs-lisp/edebug.el (edebug--overlay-breakpoints): Only
make the overlays in edebug mode, so that we remove them when we
exit.
1 job for master in 81 minutes and 42 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #3894
test-all

01:21:42