Fix the misbehaviour of kio apps (Dolphin) getting non-ascii codecs
See bug: https://bugs.kde.org/show_bug.cgi?id=432406
A question to discuss: There are still some QLoggingCategory explicitly defined here, while those does not seem to affect the behaviour of Dolphin. Should we change those into Q_LOGGING_CATEGORY macros as well?
] g QLoggingCategory -f $(find ../src -name '*.h' -o -name '*.cpp') G -v '#include'
../src/kpasswdserver/kpasswdserver.cpp:static QLoggingCategory category("kf.kio.kpasswdserver", QtInfoMsg);
../src/urifilters/localdomain/localdomainurifilter.cpp:QLoggingCategory category("kf.kio.urifilters.localdomain", QtWarningMsg);
../src/urifilters/shorturi/kshorturifilter.cpp:QLoggingCategory category("kf.kio.urifilters.shorturi", QtWarningMsg);
../src/urifilters/ikws/kuriikwsfilter.cpp:QLoggingCategory category("kf.kio.urifilters.ikws", QtWarningMsg);
../src/urifilters/ikws/kuriikwsfiltereng.cpp:QLoggingCategory category("kf.kio.urifilters.ikws", QtWarningMsg);
../src/urifilters/ikws/kurisearchfilter.cpp:QLoggingCategory category("kf.kio.urifilters.ikws", QtWarningMsg);