vim:ftplug:fzf: Add another Unicode UI character

By the way: Apparently I committed the initial commit of fzf.vim and the
one adding the TODO accidentally together in 86af2da785
("vim:ftplug:fzf:TODO: Look up other Unicode chars").

.config/vim/ftplugin/fzf.vim

@@ -1,5 +1,5 @@
 " Do not highlight Unicode box drawing chars as non-ascii
 " TODO: Look into fzf source code for all other possible Unicode chars
-let w:ignore_non_ascii_chars = '─│╭╮╰╯▌' .. get(w:, 'ignore_non_ascii_chars', '')
+let w:ignore_non_ascii_chars = '─│╭╮╰╯▌┃' .. get(w:, 'ignore_non_ascii_chars', '')
 " Update after changes
 call HighlightNonASCIIChars()