Input Widget - if assigning a button with autotab on, if the button is not the same as the first position value, clear all bindings first. Makes for a less confusing user experience when remapping joypad buttons

BizHawk.Client.EmuHawk/config/InputWidget.cs

@@ -175,6 +175,12 @@ namespace BizHawk.Client.EmuHawk
 
 				if (!IsDuplicate(bindingStr))
 				{
+					if (AutoTab)
+					{
+						ClearBindings();
+						_pos = 0;
+					}
+
 					_bindings[_pos] = bindingStr;
 				}