Functions `getPlayerIterationScores()` and `getPlayerProfileScores()`fail if supplied with multiple positions

[Flosch1006]

The following function call:

getPlayerIterationScores(
  iteration = 1005, 
  positions = c("LEFT_WINGBACK_DEFENDER","RIGHT_WINGBACK_DEFENDER"),
  token = token
)

returns the following error:

Error in `map()`:
ℹ In index: 1.
Caused by error in `parse_url()`:
! length(url) == 1 is not TRUE
Run `rlang::last_trace()` to see where the error occurred.

[Flosch1006]

The same error occurs for the following funtion call:

getPlayerProfileScores(
  iteration = 1005, 
  positions = c("LEFT_WINGBACK_DEFENDER","RIGHT_WINGBACK_DEFENDER"),
  token = token
)