publishing credentials files with a + in the name are not usable

[samperman]

If i created a publishing credential with a + in the filename, the file cannot be found when trying to use it.

> rsconnect::deployApp("myapp")
Error in accountInfo(accounts) : 
  account named '[email protected]' does not exist

Pretty sure its because of this code:

rsconnect/R/accounts.R

Lines 441 to 451 in 8c98105

	accountConfigFile <- function(name, server = NULL) {
	# if no server is specified, try to find an account with the given name
	# associated with any server
	if (is.null(server)) {
	return(list.files(accountsConfigDir(), pattern = paste0(name, ".dcf"),
	recursive = TRUE, full.names = TRUE))
	}
	normalizePath(file.path(accountsConfigDir(), server,
	paste(name, ".dcf", sep="")),
	mustWork = FALSE)
	}

list-files treats pattern as a regular expression where + has special meaning. If the + is double escaped, then it would find the file.