Revert "GUI: stop pre-dialing the Pot reset spinbox to ambient temperature"

This reverts commit 9373cc408a.

client/brewpi_gui.py

@@ -375,6 +375,13 @@ class Window(QtWidgets.QMainWindow, Ui_MainWindow):
 			self.doubleSpinBox_ambient.setValue(remembered_ambient)
 			self.doubleSpinBox_ambient.blockSignals(False)
 		self.doubleSpinBox_ambient.valueChanged.connect(self.on_ambient_entry_changed)
+		# Pre-dial the Pot reset target at the same starting point btn_pot_
+		# reset used to hardcode (ambient) - purely a one-off starting value
+		# for the user to optionally dial away from before clicking the
+		# button, so unlike the ambient spinbox it's never persisted/synced
+		# again afterwards.
+		if remembered_ambient is not None:
+			self.doubleSpinBox_pot_temp.setValue(remembered_ambient)
 		self.btn_pot_reset.clicked.connect(self.on_action_pot_reset)
 		# Only meaningful (and only shown) once the server confirms its Pot
 		# is simulated - see on_system_changed()'s "PlantSim" handling.