“I can get back home,” Geddy Lee yelped early in Rush ‘s first show in 11 years, amidst an apocalyptic flurry of drum fills from new touring member Anika Nilles on 2007’s “Far Cry.” As the rest of Rush’s Fifty Something Tour kickoff Sunday at Los Angeles’ Kia Forum demonstrated, that particular Neil Peart lyric — along with many others — was prophetic. After traversing a long, dark, grief-laden path to get there, Geddy Lee, Alex Lifeson , and their fans somehow made it all the way back to a