changelog: Correct a resolved-issue reference in 26.13.136.
changelog: Correct a resolved-issue reference in 26.13.136.

This was typo'd in the commit message of dfca21f81 which fixed the
issue, and the error propagated to the changelog.

vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile,vishwesh3/zulip-mobile