Small syntax optimizations and improvment

- Remove unused variable
- Simplify logic

Author: jonnew

OpenEphys.Onix1/AutoPortVoltage.cs

@@ -45,10 +45,7 @@ internal class PortVoltageConverter : TypeConverter
     {
         public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
         {
-            if (destinationType == typeof(string))
-                return true;
-
-            return base.CanConvertTo(context, destinationType);
+            return destinationType == typeof(string) || base.CanConvertTo(context, destinationType);
         }
 
         public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType)

OpenEphys.Onix1/ConfigurePortController.cs

@@ -82,7 +82,6 @@ public override IObservable<ContextTask> Process(IObservable<ContextTask> source
                                          .GetField(port.ToString())?
                                          .GetCustomAttribute<DescriptionAttribute>()?
                                          .Description ?? "Address " + deviceAddress.ToString();
-                    var appliedVoltage = PortVoltage.Applied;
                     var message = portVoltage.Requested.HasValue ?
                         $"Unable to acquire communication lock on {portString}" :
                         $"Unable to acquire communication lock on {portString}. You may need to manually specify a PortVoltage greater than {PortVoltage.Applied} volts, the maximum automatic value for this device.";