Filter Wizard: initial support for reading both Rx/Tx target clocks

Signed-off-by: Tim Harder <timothy.harder@analog.com>
Filter Wizard: force Rx/Tx redesigns on new filter design

Previously clicking on the new filter button would only force a single
Rx or Tx redesign before allowing save to ftr file or pushing to a
target.

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