[Ohrrpgce] SVN: james/12663 When loading slice collections for built-in screens, don't use slicetree

[subversion at HamsterRepublic.com]

james
2021-12-06 13:50:55 -0800 (Mon, 06 Dec 2021)
235
When loading slice collections for built-in screens, don't use slicetree_[1234567]_0.reld lumps anymore
This prevents breakage now that those lumps require new features (Wandering Hamster was apparently the only game using those lumps)
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U   wip/slices.bas