main: fix a bug that "~/.config/blesh/init.sh" is not detected (GitHub …

…#53 by rux616)

* Check the correct variable for rcfile existence
* README: mention XDG_CONFIG_HOME for ~/.config/blesh/init.sh

Co-authored-by: Koichi Murase <myoga.murase@gmail.com>

ble.pp

@@ -753,8 +753,8 @@ function ble/base/process-blesh-arguments {
   done
 
   if [[ ! $_ble_base_rcfile ]]; then
-    { _ble_base_rcfile=$HOME/.blerc; [[ -f $rcfile ]]; } ||
-      { _ble_base_rcfile=${XDG_CONFIG_HOME:-$HOME/.config}/blesh/init.sh; [[ -f $rcfile ]]; } ||
+    { _ble_base_rcfile=$HOME/.blerc; [[ -f $_ble_base_rcfile ]]; } ||
+      { _ble_base_rcfile=${XDG_CONFIG_HOME:-$HOME/.config}/blesh/init.sh; [[ -f $_ble_base_rcfile ]]; } ||
       _ble_base_rcfile=$HOME/.blerc
   fi
   [[ -s $_ble_base_rcfile ]] && source "$_ble_base_rcfile"