Jonas Jenwald 36111a1f40 [Regression] Remove instances of Element.classList.toggle() with *two* parameters, since browser support is limited
The Secondary Toolbar buttons for, not to mention the actual toggling of, Scroll/Spread modes are currently completely broken in older browsers (such as IE11).

As a follow-up, it'd probably be a good idea to try and find a *feature complete* `classList` polyfill that could be used instead, but this patch at least addresses the immediate regression.

Please refer to the compatibility information in https://developer.mozilla.org/en-US/docs/Web/API/Element/classList#Browser_compatibility
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