sane-sandboxed: be more strict internally about keeping paths var as absolute-paths

pkgs/additional/sane-sandboxed/sane-sandboxed

@@ -301,14 +301,14 @@ tryPath() {
   if [ "$_how" = "existing" ]; then
     # the caller wants to access either a file, or a directory (possibly a symlink to such a thing)
     if [ -e "$_path" ]; then
-      cliPathArgs+=("$_path")
+      cliPathArgs+=("$(relativeTo "$PWD" "$_path")")
       true
     fi
     false
   elif [ "$_how" = "existingFile" ]; then
     # the caller wants to access a file, and explicitly *not* a directory (though it could be a symlink *to a file*)
     if [ -f "$_path" ]; then
-      cliPathArgs+=("$_path")
+      cliPathArgs+=("$(relativeTo "$PWD" "$_path")")
       true
     fi
     false