Update condition for layer splitting logic

[Eddykasp]

allow putting each node in a split layer alone in a sublayer
removes an unnecessary restriction in the layer splitting option

[Copilot]

Pull Request Overview

Updates the condition for layer splitting logic to allow placing each node in a split layer alone in a sublayer, removing an unnecessary restriction.

• Changed the layer splitting condition from "more nodes than resulting sub-layers" to "enough nodes to fill the resulting sub-layers"
• Modified the comparison operator from > to >= in the splitting logic
• Updated the corresponding comment to reflect the new behavior

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[Eddykasp]

the elkjs build can't find the melk 0.11.0-SNAPSHOT, but updating to 0.12.0-SNAPSHOT (https://github.com/kieler/elkjs/pull/357/files) also doesn't work... Did something change?