Force vertical split to the far right

Before we were only using `wincmd|` which would create the split in the
current window. This was fine when there was only a single vertical
window, but when multiple windows already existed the split would be in
the middle of the worksplace instead of the far right.

By adding `wincmd L`, we push the window all the way to the right. This
may disrepect the `g:side_search_split_pct` setting, but I think that's
better than the side search showing up in the middle.

Author: Scott Pierce

plugin/side-search.vim

@@ -71,6 +71,7 @@ function! s:new_buffer(splitter, split_pct) abort
   execute a:splitter
   if a:splitter == 'vnew'
     execute s:percent_columns(a:split_pct) . 'wincmd|'
+    execute 'wincmd L'
   else
     execute s:percent_lines(a:split_pct) . 'wincmd_'
   endif