[patch] Tab line not redrawn when 'bt' changed

[Lech Lorens]

Problem: tab line is not updated when the value of 'bt' is changed.
To reproduce:

$ vim -c 'split | wincmd T | normal o'

By hand perform:
:set bt=nofile

Observe that the window's title in the status line reflects the change
- "[Scratch]", but the tab line still shows '| + [No Name] | + [No Name] |'.

:redraw!
Only now the tab line shows '| [Scratch] | [Scratch] |'.

The attached patch fixes the problem.

-- 
Cheers,
Lech

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diff --git a/src/option.c b/src/option.c
index d680cfb..1aa3236 100644
--- a/src/option.c
+++ b/src/option.c
@@ -6410,6 +6410,7 @@ did_set_string_option(opt_idx, varp, new_value_alloced, oldval, errbuf,
 	    }
 # endif
 	    curbuf->b_help = (curbuf->b_p_bt[0] == 'h');
+	    redraw_titles();
 	}
     }
 #endif