[Fix] 0046870 UI: Maincontrols preserve role menu when engaging/disengaging #10987
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Preserve role="menu" on slates when engaging/disengaging
Prevent JavaScript from overwriting role="menu" with role="region"
when slates are engaged. Only set role="region" if no role is
already present, and only remove it if it was set to "region".
https://mantis.ilias.de/view.php?id=46870