Vector Laplacian in Spherical Coordinates: On One Uncorrected Misprint in “Fluid Mechanics” by L.D. Landau and E.M. Lifshitz (A Comment on the Article by P.V. Lebedev-Stepanov and O.V. Rudenko “Acoustic Microfluidics: Capillary Waves and Vortex Currents in a Spherical Fluid Drop,” Acoust. Phys. 62 (4), 414 (2016))