Test suite: reset TERM to its previous value after testing.

Using konsole, I get no colored output at the end of "t7005-editor.sh"
without this patch.
Signed-off-by: NChristian Couder <chriscool@tuxfamily.org>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

t/t7005-editor.sh

@@ -4,6 +4,8 @@ test_description='GIT_EDITOR, core.editor, and stuff'
 
 . ./test-lib.sh
 
+OLD_TERM="$TERM"
+
 for i in GIT_EDITOR core_editor EDITOR VISUAL vi
 do
 	cat >e-$i.sh <<-EOF
@@ -88,4 +90,6 @@ do
 	'
 done
 
+TERM="$OLD_TERM"
+
 test_done