test: control_list: Use get() to test for control presence

Now that the ControlList::get() function returns an std::optional<>, it
is the preferred way to test if a control is present in a ControlList.
Use it in the test to prepare for removal of ControlList::contains().

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>

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