Toolbar toggle button style issue

还没有人认领这个 Issue。

Using version 4.3.0, the default style `MaterialDesignToolToggleListBoxItem` for toolbar toggle button in non-selected enabled state can be easily mistaken as disabled state.

By changing the `Opacity` property to 0.92 in the `Ripple` element, users will not mistaken the toggle button as disabled and the style will be more consistent with other toolbar button.

Locate the MaterialDesignToolToggleListBoxItem style and its Ripple element in the XAML resources. Compare the non-selected enabled toolbar toggle with other toolbar button styles, update the opacity as requested, and verify that the control no longer appears disabled.

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