Put time for playlist filename in a variable.

The old behaviour could have lead to more than 1 playlist per run.

download-yt-feeds

@@ -70,11 +70,12 @@ function main()
         # [[ ${?} -eq 0 ]] || die 3 "youtube-dl returned an error."
     done
     local files_after="$(find "${download_dir}" -type f)"
+    local time="$(date +'%F_%R')"
     while read file; do
         # https://stackoverflow.com/a/8811800/5965450
         if [[ "${files_before#*${file}}" == "${files_before}" ]]; then
             echo "${file/${download_dir}\//}" \
-                 >> "${download_dir}/New_$(date +'%F_%R').m3u"
+                 >> "${download_dir}/New_${time}.m3u"
         fi
     done <<<"${files_after}"