Detect installed apps

src/freedombone-utils-selector

     do
         app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')
 
-        if [[ $(app_is_installed $app_name) ]]; then
+        if [[ $(app_is_installed $app_name) == "1" ]]; then
             item_in_array "${app_name}" "${APPS_AVAILABLE[@]}"
             if [[ $? != 0 ]]; then
                 variants_list=$(app_variants $filename)