Possible typo error

[Muzalevsky]

On Clang 14 there is error (commit d10a627)

LimeReport/limereport/lrreportengine.cpp:835:9: error: use of bitwise '&' with boolean operands [-Werror,-Wbitwise-instead-of-logical]
    if (fileName.isEmpty() & m_fileName.isEmpty()) return false;