make sure to source the .env from the same AppDir

fix for pkgforge-dev/gpu-screen-recorder-AppImage#20

Author: Samueru-sama

useful-tools/path-mapping-hardcoded.hook

@@ -3,9 +3,11 @@
 # this script makes symnlinks to the hardcoded random dirs that were
 # patched away when 'PATH_MAPPING_HARDCODED' is used with quick-sharun
 
-CURRENTDIR="${CURRENTDIR:-${SHARUN_DIR:-${APPDIR}}}"
-if [ -f "$CURRENTDIR"/.env ]; then
-	. "$CURRENTDIR"/.env
+CURRENTDIR="$(cd "${0%/*}" && echo "$PWD")"
+
+# Use relative path to make sure we pick the `.env` from the same AppDir
+if [ -f "$CURRENTDIR"/../.env ]; then
+	. "$CURRENTDIR"/../.env
 	[ -n "$_tmp_bin" ]   && ln -sfn "$CURRENTDIR"/bin    /tmp/"$_tmp_bin"
 	[ -n "$_tmp_lib" ]   && ln -sfn "$CURRENTDIR"/lib    /tmp/"$_tmp_lib"
 	[ -n "$_tmp_share" ] && ln -sfn "$CURRENTDIR"/share  /tmp/"$_tmp_share"