Summary: Add Lubuntu Round Openbox Theme and change background and hover color for in menu search Test Plan: Tst if in menu search has the new hover and backgroun colors, same as menu Reviewers: wxl, tsimonq2, kc2bez Reviewed By: wxl, kc2bez Subscribers: The_LoudSpeaker Differential Revision: https://phab.lubuntu.me/D70