Make sure the config is writable after being copied

Author: SuperSandro2000

src/config.cpp

@@ -1045,6 +1045,11 @@ namespace config {
     // TODO: Android can possibly support this
     if (!fs::exists(stream.file_apps.c_str())) {
       fs::copy_file(SUNSHINE_ASSETS_DIR "/apps.json", stream.file_apps);
+      fs::permissions(
+        stream.file_apps,
+        fs::perms::owner_read | fs::perms::owner_write,
+        fs::perm_options::add
+      );
     }
 #endif