test: fix invalid redirection for histedit text
Appending to the file is wrong, we want new content.
--- a/tests/test-histedit-obsolete.t Sat Oct 13 15:03:00 2012 -0500
+++ b/tests/test-histedit-obsolete.t Sun Oct 14 23:03:58 2012 +0200
@@ -58,7 +58,7 @@
# m, mess = edit message without changing commit content
#
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
- $ cat >> commands.txt <<EOF
+ $ cat > commands.txt <<EOF
> pick 177f92b77385 2 c
> drop d2ae7f538514 1 b
> pick 055a42cdd887 3 d