delete redrawstatus

This is unnecessary. Removing it will still work properly and improve performance.

autoload/airline/extensions/searchcount.vim

@@ -43,6 +43,5 @@ function! s:update_searchcount(timer) abort
   if a:timer ==# s:searchcount_timer
     call searchcount(#{
           \ recompute: 1, maxcount: 0, timeout: 100})
-    redrawstatus
   endif
 endfunction