Fix issue causing `Export all` to fail.

platform/android/export/export.cpp

@@ -2787,6 +2787,10 @@ public:
 
 			String export_filename = p_path.get_file();
 			String export_path = p_path.get_base_dir();
+			if (export_path.is_rel_path()) {
+				export_path = OS::get_singleton()->get_resource_dir().plus_file(export_path);
+			}
+			export_path = ProjectSettings::get_singleton()->globalize_path(export_path).simplify_path();
 
 			copy_args.push_back("-Pexport_path=file:" + export_path);
 			copy_args.push_back("-Pexport_filename=" + export_filename);