fix: typo in gui for temperature sweeps

Python_script/climate-lab-gui.py

@@ -159,7 +159,7 @@ class TestStandMainWindow(QMainWindow):
 
             elif measurement_type == 'humidity':
                 humidities = meas.perform_sweep(start_parameter, stop_parameter, step_parameter, fixed_parameter,
-                                                soaking_time.value(), stable_reads, 'humidity')
+                                                soaking_time, stable_reads, 'humidity')
                 hum_extensions = []
                 for h in humidities:
                     hum_extensions.append(str(fixed_parameter) + 'deg_' + str(h) + 'rh')