Change: Make all dropdown lists extend width if necessary.

This removes the auto_width parameter from ShowDropDown(At).

src/script/script_gui.cpp

@@ -477,7 +477,7 @@ struct ScriptSettingsWindow : public Window {
 								list.emplace_back(new DropDownListCharStringItem(config_item.labels->Find(i)->second, i, false));
 							}
 
-							ShowDropDownListAt(this, std::move(list), old_val, -1, wi_rect, COLOUR_ORANGE, true);
+							ShowDropDownListAt(this, std::move(list), old_val, -1, wi_rect, COLOUR_ORANGE);
 						}
 					}
 				} else if (IsInsideMM(x, 0, SETTING_BUTTON_WIDTH)) {