fix content type detection to allow adding via curl

fixed in cmdkit1.0

License: MIT
Signed-off-by: keks <keks@cryptoscope.co>

TODO.md

 # TODO before merge
 
 - t0110 fails (marked as known breakage for now) Issue: go-ipfs-cmds#47
-- t0410 fails (marked as known breakage for now)

test/sharness/t0410-api-add.sh

@@ -13,7 +13,7 @@ test_init_ipfs
 # Verify that that API add command returns size
 
 test_launch_ipfs_daemon
-test_expect_failure "API Add response includes size field" '
+test_expect_success "API Add response includes size field" '
   echo "hi" | curl -s -F file=@- "http://localhost:$API_PORT/api/v0/add" | grep "\"Size\": *\"11\""
 '
 test_kill_ipfs_daemon