refactor(redraw): no type argument in update_screen()

This was used in the past with assumption that curwin/curbuf
is "special" but this has not been true since basically forever
at this point.

Reduce NOT_VALID/CLEAR panic in options.lua . These should not
be set if an effect of the option is causing something
which by itself invokes redraw_later().

src/nvim/autocmd.c

@@ -2720,7 +2720,7 @@ static void do_autocmd_focusgained(bool gained)
       redrawcmdline();
     } else if ((State & MODE_NORMAL) || (State & MODE_INSERT)) {
       if (must_redraw != 0) {
-        update_screen(0);
+        update_screen();
       }
 
       setcursor();