contrib: Fix mellanox platform defaults (btl/sm -> btl/vader)

Signed-off-by: Artem Polyakov <artpol84@gmail.com>

contrib/platform/mellanox/optimized.conf

@@ -61,7 +61,7 @@ scoll_fca_enable = 0
 #rmaps_base_mapping_policy = dist:auto
 coll = ^ml
 hwloc_base_binding_policy = core
-btl = sm,openib,self
+btl = vader,openib,self
 # Basic behavior to smooth startup
 mca_base_component_show_load_errors = 0
 orte_abort_timeout = 10