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Issue #26665: Remove mis-use of ``$`` in activate.fish.

This is a revertion of cfc66e37eb8e.

Thanks to 鄭景文 for the bug report. Thanks to Tin Tvrtković, Xiang
Zhang, and Dan McCombs for diagnosing the issue.
B
Brett Cannon committed
660c8fc997f34b7474c23a993105a37b7277554f
Parent: 15287f8