[PATCH] t/t0015-hash.sh: removed unnecessary '\' at line end

From: Jaydeep P Das <jaydeepjd.8914@gmail.com>
Date: Feb 8, 2022, 09:23 UTC
Message-ID: <20220208092339.651761-1-jaydeepjd.8914@gmail.com>

Fixed code as per coding style guide.

Since `|` already implies that the statement is not over, therefore adding a `\` in the end is not necessary.

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