shared/modtulip: Fix signature of tulip_amy_get_synth_commands for include_fx.

[dpwe]

When we added global FX outputs to get_synth_commands, we added a second arg to Amy/Amy/init.py's get_synth_commands to specify include_fx. This didn't get propagated to the wrapper in tulip/shared/modtulip, meaning calls from Micropython to get_synth_commands always failed. This change fixes modtulip's tulip_amy_get_synth_commands to accept one (synth) or two (synth, include_fx) args.

[github-actions]

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🎛️ HW CI (physical bench)

AMYboard (USB-MIDI + AMY zP → audio): ❌ FAIL — a check did not match, or the run errored. See the log/artifacts.

Tulip (TULIP4_R11; serial-REPL audio + WiFi screenshot): ✅ PASS — flashed this PR’s firmware; all checks matched the references.

⬇️ Artifacts: recordings · screenshot · serial logs · run logs

_{Self-hosted bench. Audio spectral-compared to ref/hwci_basic.wav + ref/tulip_basic.wav; Tulip screenshot pixel-compared to ref/tulip_screenshot.png. Both analog outs share one capture card, so the tests run sequentially.}