Keep fat in the global enabled_layoutsHEADmaster

A config reload resets every tab's enabled_layouts to the global value
and switches any tab whose current layout name is not in that list. With
the global list restricted to splits, reloading turned the syswatch
session tab from fat into splits. Listing a bare fat keeps it, along
with its session-set options.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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