x11-display: Split out restoring of active workspace
Splitting out the X11 display initialization from display_open() broke restoring the previously active workspace in two ways:
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when dynamic workspaces are used, the old workspaces haven't been restored yet, so we stay on the first workspace
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when static workspaces are used, the code tries to access the compositor that hasn't been initialized yet, resulting in a segfault
Fix both those issues by splitting out restoring of the active workspace.
Fixes #479 (closed)