test(ema): Rename test that trips TruffleHog's Lob detector (#4371)

TruffleHog's Lob API-key detector matches `\b((live|test)_[a-zA-Z0-9_]{35})\b`.
One EMA config test was named `test_` plus exactly 35 word characters, so it
matched, and Lob's verifier treats the 403/422 that api.lob.com returns for junk
keys as proof of a live key. That failed the Security workflow on main after
huggingface/lerobot#4323 with "Found verified Lob result" and exit code 183.

Add one word to the name so the suffix is 39 characters rather than 35. No
behavior change. Note that the offending string is deliberately not spelled out
here: TruffleHog scans commit messages as well as added lines, so quoting it
would retrigger the very detector this commit is working around.

Refs #4323

Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

tests/training/test_ema.py

@@ -36,7 +36,7 @@ N_EPISODES = 2
 EPISODE_LENGTH = 12
 
 
-def test_ema_config_defaults_match_reference():
+def test_ema_config_defaults_match_the_reference():
     cfg = EMAConfig()
     assert not cfg.enable
     assert cfg.inv_gamma == 1.0