When calling VimwikiMakeYesterdayDiary (or Tomorrow) the wiki_nr is
looked up by vimwiki#diary#diary_date_link without access to the passed
count, which would result in the creation of the file in the correct
place, but with the diary_frequency of another wiki. Modify
vimwiki#diary#diary_date_link to take a possible third argument as the
wiki_nr+1 and modify the commands to pass <count> as the third argument.
Fixes: #1365
Bence Ferdinandy
5d86b625f5
