gdb-dap: disable events when deleting breakpoints

when I disable a breakpoint in VS Code the breakpoint is removed
instead. I compared the behavior to lldb-dap and disabled events when
removing a breakpoint. Now it is possible to disable and enable
breakpoints in VS Code.

gdb/python/lib/gdb/dap/breakpoint.py

@@ -208,9 +208,9 @@ def _set_breakpoints_callback(kind, specs, creator):
                     }
                 )
 
-    # Delete any breakpoints that were not reused.
+        # Delete any breakpoints that were not reused.
-    for entry in saved_map.values():
+        for entry in saved_map.values():
-        entry.delete()
+            entry.delete()
     return result