patch 8.1.1768: man plugin changes setting in current window

Problem:    Man plugin changes setting in current window.
Solution:   Set options later. (Jason Franklin)
diff --git a/runtime/ftplugin/man.vim b/runtime/ftplugin/man.vim
index fb3f7f9..4591c47 100644
--- a/runtime/ftplugin/man.vim
+++ b/runtime/ftplugin/man.vim
@@ -174,7 +174,6 @@
       else
 	let open_cmd = a:cmdmods . ' split'
       endif
-      setl nonu fdc=0
     endif
   endif
 
@@ -183,7 +182,7 @@
   " Avoid warning for editing the dummy file twice
   setl buftype=nofile noswapfile
 
-  setl ma nonu nornu nofen
+  setl fdc=0 ma nofen nonu nornu
   silent exec "norm! 1GdG"
   let unsetwidth = 0
   if empty($MANWIDTH)