[libcalamares] After running the checker, re-compute satisfaction

- If nothing is added to the model (e.g. it is empty) then the satisfaction
  still needs to be re-calculated (to true).

src/libcalamares/modulesystem/RequirementsChecker.cpp

@@ -84,6 +84,7 @@ RequirementsChecker::finished()
         }
 
         m_model->describe();
+        m_model->changeRequirementsList();
         QTimer::singleShot( 0, this, &RequirementsChecker::done );
     }
 }