Enable the vendor-directory remote by default

It doesn't do anything if empty, and it's one less foot-gun when deploying
local metadata archives like on RHEL.

data/remotes.d/vendor-directory.conf

@@ -1,7 +1,7 @@
 [fwupd Remote]
 # this remote provides dynamically generated metadata shipped by the OS vendor and can
 # be found in @datadir@/fwupd/remotes.d/vendor/firmware
-Enabled=false
+Enabled=true
 Title=Vendor (Automatic)
 # using `Keyring=none` is required as directory remotes requires the local user to trust the person
 # putting the files in the immutable local location.