models: don't freeze the ui on an unset LagdToggleDelay (#2026)

models: don't block the ui on an unset LagdToggleDelay

Params.get's second positional is `block`, not a fallback value, so
get("LagdToggleDelay", "0.2") passes block=True and does a blocking read.
When the param is unset this spins the ui thread until it appears, freezing
the models panel (the description is rebuilt every frame). Read it the same
way livedelay/lagd_toggle.py does.

Claude-Session: https://claude.ai/code/session_01EGMnVnSk5inGTrd7kuDVG9

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: James Vecellio-Grant <159560811+Discountchubbs@users.noreply.github.com>

openpilot/selfdrive/ui/sunnypilot/layouts/settings/models.py

@@ -115,7 +115,7 @@ class ModelsLayout(Widget):
     if lagd_toggle:
       desc += f"<br>{tr('Live Steer Delay:')} {ui_state.sm['lateralDelay'].lateralDelay:.3f} s"
     elif ui_state.CP is not None:
-      sw = float(ui_state.params.get("LagdToggleDelay", "0.2"))
+      sw = float(ui_state.params.get("LagdToggleDelay", return_default=True))
       cp = ui_state.CP.steerActuatorDelay
       desc += f"<br>{tr('Actuator Delay:')} {cp:.2f} s + {tr('Software Delay:')} {sw:.2f} s = {tr('Total Delay:')} {cp + sw:.2f} s"
     self.lagd_toggle.set_description(desc)