commands/guru: fix jumplist problem when same buffer on definition
commands/guru: fix jumplist problem when same buffer on definition

Always save current cursor position use "normal! m'", and 'edit' with
'keepjumps' when different filename.

Remove add destination filename to locationlist.

Signed-off-by: Koichi Shiraishi <2e5bdfebde234ed3509bcfc18121c70b6631e207@gmail.com>

zchee/nvim-go,zchee/nvim-go