Color Correction to 353 GHz Templates

[brandonshensley]

Based on the slides emailed on Oct. 19, @delabrou recommends we, "[m]ultiply dust template maps by 0.92 to get a template at 353 GHz rather than integrated in the Planck 353 GHz band." Note that a similar color correction factor appears in Planck 2018 XI, Table 2 as 1/1.098 = 0.911. I suggest we use this value so that we can cite the Planck table. @giuspugl