Undo change to toggleChecked hasAllowMergeOnSkippedPipeline

What does this MR do and why?

Reverts a change to one line from a previous MR: !138008 (diffs)

The above MR undid the change to merge_checks_app.vue from 8d86ff06

This line was not intended to be changed, due to a merge conflict it was accidentally changed.

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