[nvim] Fix wiki.vim keymaps

Plugin changed its settings for enabling default keymaps from 0/1 to
string definitions.

See a4f2fdb6af

nvim/.config/nvim/plugin/wiki.vim

@@ -7,7 +7,7 @@ endif
 " filetypes to automatically enable the plugin for, seems to take file endings
 " rather than vim ft
 let g:wiki_filetypes = ['md', 'mkd', 'markdown', 'wiki']
-let g:wiki_mappings_use_defaults = 1
+let g:wiki_mappings_use_defaults = 'all'
 
 " wiki automatic link creation
 " add .md to the end of links by default

nvim/.config/nvim/spell/en.utf-8.add

@@ -28,3 +28,4 @@ informationalism
 Prestholdt
 internet
 Beckert
+conditionality