Had Stevie Nicks ditched Fleetwood Mac and joined Tom Petty & the Heartbreakers circa Damn the Torpedoes, this heartland-rock anthem might’ve found a home on Side A, sandwiched between “Even the Losers” and “Shadow of a Doubt.” A flashback to the glory days of Seventies pop-rock, “Standing in the Shadows” lights up with coed harmonies, electric-guitar jangle and California cool…