qemu: capabilities: Fix logic for formatting 'reconnect' parameter

qemu: capabilities: Fix logic for formatting 'reconnect' parameter

In commit e4d058866e9 I've converted the code to use the modern
'reconnect-ms' parameter instead of 'reconnect' but messed up the logic
for the time when 'reconnect' will be removed.

We need to check QEMU_CAPS_NETDEV_STREAM_RECONNECT_MILISECONDS
individually and not based on QEMU_CAPS_NETDEV_STREAM_RECONNECT.

Fix the logic as upstream qemu now removed 'reconnect'.

Fixes: e4d058866e9563756349de6b3f451a53e64ca872
Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>