This issue got introduced in 4bf7f86 due to double
Fixes https://github.com/PrivateBin/PrivateBin/issues/557
Fixes https://github.com/PrivateBin/PrivateBin/issues/558
Also _inverted_ the logic/variable name for containsNoLinks to
the more logical one "containsLinks" to avoid too many negations.
Also verified that the attachment name is stil properly displayed
when you clone a paste.