[FIX] User Information: Change bccme field filter of send message form to 'bool'

Links:

• Bug 47 on https://dev.tiki.org/Regressions-in-26x
• Task https://avan.tech/item93099-Fix-regressions-from-25x-to-26x

This Warning comes from the 'bccme' (Send me a copy) field in the send form whose filter has been set to 'bcc' at the beginning of the tiki-user_information.php file. I found that all supported filters are listed in lib/core/TikiFilter.php and there is no 'bcc' there. From what I understood after analysis, I think that this field must have the 'bool' filter and not 'bcc' since it is just a checkbox which allows to say whether or not a copy email should be sent to me.