Remove copyright year in emails

[cez81]

• Gitea version (or commit ref): 1.1.0+61-g888dee3b
• Git version: N/A
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Description

I think the copyright year should be remove from the following email templates.
gitea\templates\mail\auth\activate.tmpl
gitea\templates\mail\auth\activate_email.tmpl
gitea\templates\mail\auth\register_notify.tmpl
gitea\templates\mail\auth\reset_passwd.tmpl

Screenshots