fix(storage): fix std_filesystem test

it uses vfs_fat_truncate in resize_file

Author: Lapshin

tools/test_apps/storage/std_filesystem/main/test_ops.cpp

@@ -140,8 +140,7 @@ class OpsTest {
         }
         std::filesystem::copy_file("/test/file", "/test/file_size");
         CHECK(std::filesystem::file_size("/test/file_size") == 11);
-        // Not supported: libstdc++ has to be built with _GLIBCXX_HAVE_TRUNCATE
-        CHECK_THROWS(std::filesystem::resize_file("/test/file_size", 20));
+        std::filesystem::resize_file("/test/file_size", 20);
         CHECK(std::filesystem::remove("/test/file_size"));
     }