qcacmn: Provide valid range for gScanProbeRepeatTime INI

The default value provided for the INI item
gScanProbeRepeatTime for WIN is 50 which is
beyond the specified INI range 0 and 30.

Changing the max value to 50 to accommodate
the default value used by the INI and avoid
warning while parsing INI values.

CRs-Fixed: 2633733
Change-Id: I442d07de55813c930b77e7dfffcdebf5372c5c0e