idlcli: vibrator: Fix Compose Scale Validation

The vibrator compose API actually allows a value of 0.0, which
represents the minimum feelable intensity.

Test: idlcli vibrator compose 0 6 0.0
Signed-off-by: Harpreet Eli Sangha <eliptus@google.com>
Change-Id: Ia02684f1012f9fbc508cfd2fd05bb114cba24a68