Handle axis names in fscatterplot that have dashes in them

[lianos]

Gene names with dashes that end up in data columns for scatterplot b0rk it, eg. like the following data

fds <- exampleFacileDataSet()
dat  <- samples(fds) %>%
  with_assay_data("1") %>%
  with_assay_data("503538")

dat will look like so:

# A tibble: 6 x 4
  dataset sample_id                      A1BG `A1BG-AS1`
  <chr>   <chr>                         <dbl>      <dbl>
1 BLCA    TCGA-BL-A0C8-01A-11R-A10U-07 -0.154      -2.65
2 BLCA    TCGA-BL-A13I-01A-11R-A13Y-07  2.74       -1.89
3 BLCA    TCGA-BL-A13J-01A-11R-A10U-07  0.726      -2.05
4 BLCA    TCGA-BL-A3JM-01A-12R-A21D-07  0.171      -2.16
5 BLCA    TCGA-BT-A0S7-01A-11R-A10U-07  2.38       -2.29
6 BLCA    TCGA-BT-A0YX-01A-11R-A10U-07  0.152      -2.37

But fscatterplot(dat, c("A1BG", "A1BG-AS1")) errors out