samples: bt: hids: set report id in the report_map

The default report_map for peripheral_hids mouse sample descriptor is
missing a report id field. This seems to be confusing Android hosts into
somehow parsing reports incorrectly.

Adding a report id seems to fix the problem and still works correctly on
bluez hosts.

Signed-off-by: Fabio Baltieri <fabiobaltieri@google.com>