training_server: Fix UnboundLocalError in TTFT model training

[RishabhSaini]

Error: UnboundLocalError: cannot access local variable 'ttft_feature_cols_tree' where it is not associated with a value at training_server.py:640

Cause: Variables defined inside if len(df_ttft) >= MIN_SAMPLES_FOR_RETRAIN block but referenced outside it due to incorrect indentation.

Fix: Indented TTFT training code block to match TPOT section structure.

[linux-foundation-easycla]

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