[GLOBAL] Fix Makefile typo

One of Makefile action is to copy `helm` directory into `packages` one.
Change done in order to choose helm binary accidentally made this
behavior to work _only_ if helm binary is `helm`.
This patch set it back to previous behaviour for this particular
command.

Issue-ID: OOM-2562
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
Change-Id: I22c52d538f9f396bd4028b6e0f0adcecb8e8df61
1 file changed