Invert logic

src/freedombone-installer

@@ -865,7 +865,7 @@ function install_apps_from_webadmin {
                 fi
 
                 # remove app from the removed file
-                if ! grep -Fxq "_${app_name}_" "$REMOVED_APPS_FILE"; then
+                if grep -Fxq "_${app_name}_" "$REMOVED_APPS_FILE"; then
                     sed -i "/_${app_name}_/d" "$REMOVED_APPS_FILE"
                 fi