dataengines/weather: Fix build failure
The build failure
ion_envcan.cpp:480:58: error: incompatible operand types ('QStringBuilder<[...], QString>' and 'QStringBuilder<[...], const QString &>')The build failure
ion_envcan.cpp:480:58: error: incompatible operand types ('QStringBuilder<[...], QString>' and 'QStringBuilder<[...], const QString &>')