lint: remove unused aws s3 env var

Author: dshemetov

scripts/dashboard.R

@@ -2,7 +2,6 @@ tar_project <- Sys.getenv("TAR_PROJECT", "covid_hosp_explore")
 external_scores_path <- Sys.getenv("EXTERNAL_SCORES_PATH", "")
 debug_mode <- as.logical(Sys.getenv("DEBUG_MODE", TRUE))
 use_shiny <- as.logical(Sys.getenv("USE_SHINY", FALSE))
-use_aws_s3_only <- as.logical(Sys.getenv("USE_AWS_S3_ONLY", FALSE))
 aws_s3_prefix <- Sys.getenv("AWS_S3_PREFIX", "exploration")
 aws_s3_prefix <- paste0(aws_s3_prefix, "/", tar_project)
 suppressPackageStartupMessages({