fix: allow resetting clip_skip to its default value #697
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CLIPTextModel currently ignores attempts to set clip_skip back to -1, retaining the previously set value instead. While this is not an issue to the sd command (which does not support changing clip_skip between generations), it affects frontends that reuse model instances for multiple images.
Since each model version's default clip_skip value is defined by its respective Conditioner class, it needs to be applied every time they get a different clip_skip value, so move that logic from their constructors into their set_clip_skip methods.
Related: LostRuins/koboldcpp#1546
(the original PR #687 was closed because I submitted it on the master branch by mistake)