[PATCH next] t7407: use 'cut' utility rather than bash's substring expansion notation

From: Brandon Casey <redacted>

The substring expansion notation is a bashism that we have not so far
adopted.  There is precedence for using the 'cut' utility for extracting
a substring.  So do so here.

Signed-off-by: Brandon Casey <redacted>
---
 t/t7407-submodule-foreach.sh |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/t7407-submodule-foreach.sh b/t/t7407-submodule-foreach.sh
index de1730d..44ea8ac 100755
--- a/t/t7407-submodule-foreach.sh
+++ b/t/t7407-submodule-foreach.sh

@@ -207,8 +207,8 @@ cat > expect <<EOF
  $nested2sha1 nested1/nested2 (heads/master)
  $nested3sha1 nested1/nested2/nested3 (heads/master)
  $submodulesha1 nested1/nested2/nested3/submodule (heads/master)
- $sub1sha1 sub1 (${sub1sha1:0:7})
- $sub2sha1 sub2 (${sub1sha1:0:7})
+ $sub1sha1 sub1 ($(echo $sub1sha1 | cut -c 1-7))
+ $sub2sha1 sub2 ($(echo $sub1sha1 | cut -c 1-7))