Fix main contact uf url on merge screen

[jitendrapurohit]

Overview

Fix main contact uf url on merge screen.

Before

UF url of the main contact links to the duplicate user record.

In the above screenshot, both username links to the same uf record.

After

Correct url is rendered.

[civibot]

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[demeritcowboy]

Can reproduce the problem and patch fixes it. Seems like an obvious typo during the previous refactor that touched these lines.

Looks good to merge.