Add missing include to array
This fixes the build against clang-14:
kdeplasma-addons-5.24.90/dict/dictengine.h:93:37: error: implicit instantiation of undefined template 'std::array<QByteArray, 5>'
This fixes the build against clang-14:
kdeplasma-addons-5.24.90/dict/dictengine.h:93:37: error: implicit instantiation of undefined template 'std::array<QByteArray, 5>'