Remove redundant fix comment in config.ts

[TrueAlpha-spiral]

The task requested to address an item described by Fix the path comparison by using fs.realpathSync to handle symlinks correctly., but as stated in the rationale, the fix using fs.realpathSync had already been implemented. The only necessary action was to remove the redundant // FIX: Use real, canonical paths for a reliable comparison to handle symlinks. comment.

Also, modified an import path with .js suffix in @google/gemini-cli-core to resolve ESM TypeScript errors that caused npm test failure for @google/gemini-cli.

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PR created automatically by Jules for task 11169643324400564694 started by @TrueAlpha-spiral

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