Hap: Fix verifying input parameters

This fixes:
 - some methods were shadowing previously set invalid group ID
   error code with invalid preset error code on invalid input params
 - isPresetIndexValid() returning true for group which was empty

Bug: 150670922
Tag: #feature
Sponsor: jpawlowski@
Test: atest BluetoothInstrumentationTests
Change-Id: Ibc0db41e85b1c75a89621683df4e606353545974