tests/test-diff-color.out

patchbomb: fix 'echo -en' bashism in test-patchbomb

The echo command doesn't accept options in some shells.
printf is required by the SUSv2 (Single UNIX Specification v2).

adding a
% default context
diff -r cf9f4ba66af2 a
--- a/a
+++ b/a
@@ -2,7 +2,7 @@
 c
 a
 a
-b
+dd
 a
 a
 c
% --unified=2
diff -r cf9f4ba66af2 a
--- a/a
+++ b/a
@@ -3,5 +3,5 @@
 a
 a
-b
+dd
 a
 a
% diffstat
 a |  2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
% record
diff --git a/a b/a
old mode 100644
new mode 100755
1 hunks, 2 lines changed
examine changes to 'a'? [Ynsfdaq?] @@ -2,7 +2,7 @@
 c
 a
 a
-b
+dd
 a
 a
 c
record this change to 'a'? [Ynsfdaq?] 
rolling back last transaction
% qrecord
diff --git a/a b/a
old mode 100644
new mode 100755
1 hunks, 2 lines changed
examine changes to 'a'? [Ynsfdaq?] @@ -2,7 +2,7 @@
 c
 a
 a
-b
+dd
 a
 a
 c
record this change to 'a'? [Ynsfdaq?]