是否允许不打开任何开关？
如果启用此设置，则按下当前打开的开关会将其关闭，因此没有任何开关处于打开状态。如果禁用此设置，则按下当前打开的开关将不改变该开关的状态。
请注意，如果在加载场景或实例化 Toggle Group 时，组中的所有开关均未打开，那么即使 allowSwitchOff 为 false，该组也不会立即执行其约束。它将只阻止用户关闭开关。
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