`fit_prog_gsynth` transformations aren't saved back to variables

[jntrcs]

fit_prog_gsynth attempts to transform two variables to numeric. However, because the transformations are not saved to df_long, they have no end effect and the function continues on with character vectors instead of numeric vectors.

augsynth/R/outcome_models.R

Line 198 in 664c0c7

transform(long_df, time = as.numeric(time))

(Also, FWIW, the documentation for transform warns against using it in anything other than interactive use)