gdb: Turn on logging by default

While at it, clean up duplicate setting.

gdb/.gdbinit.d/init

@@ -5,10 +5,10 @@ set auto-load safe-path /
 set auto-load python-scripts on
 set auto-load local-gdbinit
 set pagination off
-set logging off
+set logging on
+set logging overwrite on
 set mi-async on
 set non-stop off
-set breakpoint pending on
 
 # Adapted to use neovim from https://github.com/cyrus-and/gdb-dashboard/issues/20
 define vo