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
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
% should issue warning
adding a
created new head
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
% should not issue warning
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
marked working directory as branch testing
% should not issue warning