Fix wrong `target` prop type on `DashCardParameterMapper` (#37966)

* Fix wrong `target` prop type on `DashCardParameterMapper`

* Remove unneeded prop from the test setup

frontend/src/metabase/dashboard/components/DashCard/DashCardParameterMapper/DashCardCardParameterMapper.jsx

@@ -74,7 +74,7 @@ DashCardCardParameterMapper.propTypes = {
   card: PropTypes.object.isRequired,
   dashcard: PropTypes.object.isRequired,
   editingParameter: PropTypes.object.isRequired,
-  target: PropTypes.object,
+  target: PropTypes.array,
   mappingOptions: PropTypes.array.isRequired,
   metadata: PropTypes.object.isRequired,
   setParameterMapping: PropTypes.func.isRequired,

frontend/src/metabase/dashboard/components/DashCard/DashCardParameterMapper/DashCardCardParameterMapper.unit.spec.jsx

@@ -37,7 +37,6 @@ const setup = options => {
       card={createMockCard()}
       dashcard={createMockDashboardCard()}
       editingParameter={{}}
-      target={null}
       mappingOptions={[]}
       metadata={metadata}
       setParameterMapping={jest.fn()}