Revert "Removed flaky flag"

This reverts commit 4df7999.

Author: cwoffenden

test/test_browser.py

@@ -5504,6 +5504,7 @@ def test_audio_worklet_params_mixing(self, args):
   # Tests AudioWorklet with emscripten_lock_busyspin_wait_acquire() and friends
   @requires_sound_hardware
   @also_with_minimal_runtime
+  @flaky('https://github.com/emscripten-core/emscripten/issues/25245')
   def test_audio_worklet_emscripten_locks(self):
     self.btest_exit('webaudio/audioworklet_emscripten_locks.c', cflags=['-sAUDIO_WORKLET', '-sWASM_WORKERS', '-pthread'])