generate_author_yml does not retain affiliation order for each person

[conig]

Describe the bug
generate_author_yml on devel creates yaml for authors and affiliations. However, it sorts affiliations within each person. It should respect the listed order of affiliations by person.

To Reproduce
Note: "Person 2" = c("uni2", "uni1")

# remotes::install_github("crsh/papaja@devel")
library(papaja)

generate_author_yml (
  researchers = list(
    "Person 1" = c("uni1", "uni2"),
    "Person 2" = c("uni2", "uni1")
  ),
  affiliations = list(
    "uni1" = "The First Uni",
    "uni2" = "The Second Uni"
  ),
  corres_name = "Person 1",
  corres_address = "123 Example Street, Street, state 2121",
  corres_email = "person1@example.com"
)
#> author:
#>   - name          : "Person 1"
#>     affiliation   : "1,2"
#>     corresponding : yes
#>     address       : "123 Example Street, Street, state 2121"
#>     email         : "person1@example.com"
#>   - name          : "Person 2"
#>     affiliation   : "1,2"
#> 
#> 
#> affiliation:
#>   - id            : "1"
#>     institution   : "The First Uni"
#>   - id            : "2"
#>     institution   : "The Second Uni"

Expected behavior
Person 2's affiliation should be 2,1 not 1,2

[crsh]

Fixed in #570