In a short-and-sweet 58 seconds that feel rooted in a familiar yet distant gossamer dreamland, “Wish on an Eyelash” opens Mallrat’s debut studio album, Butterfly Blue. Wispy, succinct, and possessive of an elusive sense of magic, from its lyrical candor to its topline, “Wish on an Eyelash” sounds like a song The Chainsmokers would have taken on in their mid-2000’s remix era, had it existed then. But in the here and now, “Wish on an Eyelash” acts as a time machine that sonically transports Andrew Taggart and Alex Pall back to this period. On an…