fix: linting error for list widget

[jsartisan]

The list widget children were giving a linting error when currentIndex was not used in the binding.

Fixes #7190

Type of change

Please delete options that are not relevant.

• Bug fix

How Has This Been Tested?

• manually tested

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

Test coverage results 🧪

⚪ Total coverage has not changed

// Code coverage diff between base branch:release and head branch: fix/list-widget-linting-bug 

Status	File	% Stmts	% Branch	% Funcs	% Lines
🔴	app/client/src/mockResponses/WidgetConfigResponse.tsx	14.55 (-0.26)	0 (0)	0 (0)	15.53 (-0.31)
🟢	app/client/src/utils/autocomplete/TernServer.ts	50.71 (0.24)	39.13 (0.87)	36.21 (0)	55.35 (0.27)

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