Weird fix to "ggsave does not save fonts properly when saving as svg". Anyone knows why this works?

[Alexis Solis]

I use a custom font for my ggplot2 theme (adhering to my company's policies). Using both `ggplot2 `and `svglite`, I've been saving some plots as `.svg`. However, the fonts don't render correctly in PowerPoint (although they DO render correctly when opening the .svg file in say, a browser). I realized that adding the line `device = svg`  inside the `ggsave()` function WITHOUT the quotations around `svg` fixes the issue. Why would this happen? See reprex below for an example:

```
library(tidyverse)
library(svglite)

# Import ggplot2 theme, which uses the DINPro Font
dinpro_path <- "path/to_custom/dinpro_theme.R"
source(dinpro_path)

# Generic plot
mtcars %>%
  ggplot(aes(mpg, disp)) +
  geom_point() +
  labs(
    title = "plot_title",
    subtitle = "– plot_subtitle"
  ) +
  dinpro_theme()

# This DOES NOT work since fonts don't show in PowerPoint or any other MS Office product.
ggsave(
  filename = "svg_name.svg",
  path = "charts/",
  device = 'svg',
  width = 8,
  height = 11,
  units = 'cm',
  dpi = 300
)


# This works perfectly!
ggsave(
  filename = "svg_name.svg",
  path = "charts/",
  device = svg,
  width = 8,
  height = 11,
  units = 'cm',
  dpi = 300
)
```
I'm using the latest versions of the packages:
ggplot2: ‘3.3.5’
svglite: ‘2.0.0’