fix #1846 remove unnecessary check for colon in columName. Email template...

fix #1846 (closed) remove unnecessary check for colon in columName. Email template variables without colons did not get replaced.

In commit 73bfc813 a strict check was added to check whether columnName isset, but in addition a check for a colon (:) was also added. This is not a character that always appears in the template variables. In the case of template variable contacts_firstname in an email template, the 'firstname' does not have a colon, and thus no longer got replaced after this change.