The House Judiciary Committee chairman said Tuesday he is backing off his controversial push to shift control of the Chelsea District Court to the Boston Municipal Court, saying his plan had created a perception of a legislative power play against the courts. The Globe reported Tuesday that Representative Eugene L. O’Flaherty quietly attached an amendment to the House budget after Lynda M. Connolly, the chief justice of the state’s district court system, took disciplinary action against Chelsea’s clerk magistrate, Kevin G. Murphy, a close family friend and political supporter of O’Flaherty’s.