Filter Wizard: make sure HB1 value is valid for advanced settings

Setting an HBS value > 2 when advanced settings are not enabled will
cause an error when advanced settings are turned on since there are no
matching strings for HB1 past 2x when advanced is enabled.

Signed-off-by: Tim Harder <timothy.harder@analog.com>
Filter Wizard: make sure HB values are initialized to defaults

Signed-off-by: Tim Harder <timothy.harder@analog.com>