[weather dataengine] bbc,envcan,noaa: fix day/night calculation for observe

"time" engine ignores the timezone in the passed DateTime variable,
only looks at the one given in the first argument

dataengines/weather/ions/bbcukmet/ion_bbcukmet.cpp

@@ -747,7 +747,8 @@ bool UKMETIon::readObservationXMLData(const QString& source, QXmlStreamReader& x
             (data.observationDateTime.isValid() &&
             (!qIsNaN(data.stationLatitude) && !qIsNaN(data.stationLongitude)));
         if (canCalculateElevation) {
-            data.solarDataTimeEngineSourceName = QStringLiteral("Local|Solar|Latitude=%1|Longitude=%2|DateTime=%3")
+            data.solarDataTimeEngineSourceName = QStringLiteral("%1|Solar|Latitude=%2|Longitude=%3|DateTime=%4")
+                .arg(QString::fromUtf8(data.observationDateTime.timeZone().id()))
                 .arg(data.stationLatitude)
                 .arg(data.stationLongitude)
                 .arg(data.observationDateTime.toString(Qt::ISODate));

dataengines/weather/ions/envcan/ion_envcan.cpp

@@ -739,7 +739,8 @@ bool EnvCanadaIon::readXMLData(const QString& source, QXmlStreamReader& xml)
             (data.observationDateTime.isValid() &&
             (!qIsNaN(data.stationLatitude) && !qIsNaN(data.stationLongitude)));
         if (canCalculateElevation) {
-            data.solarDataTimeEngineSourceName = QStringLiteral("Local|Solar|Latitude=%1|Longitude=%2|DateTime=%3")
+            data.solarDataTimeEngineSourceName = QStringLiteral("%1|Solar|Latitude=%2|Longitude=%3|DateTime=%4")
+                .arg(QString::fromUtf8(data.observationDateTime.timeZone().id()))
                 .arg(data.stationLatitude)
                 .arg(data.stationLongitude)
                 .arg(data.observationDateTime.toString(Qt::ISODate));

dataengines/weather/ions/noaa/ion_noaa.cpp

@@ -491,7 +491,8 @@ bool NOAAIon::readXMLData(const QString& source, QXmlStreamReader& xml)
             (data.observationDateTime.isValid() &&
             (!qIsNaN(data.stationLatitude) && !qIsNaN(data.stationLongitude)));
         if (canCalculateElevation) {
-            data.solarDataTimeEngineSourceName = QStringLiteral("Local|Solar|Latitude=%1|Longitude=%2|DateTime=%3")
+            data.solarDataTimeEngineSourceName = QStringLiteral("%1|Solar|Latitude=%2|Longitude=%3|DateTime=%4")
+                .arg(QString::fromUtf8(data.observationDateTime.timeZone().id()))
                 .arg(data.stationLatitude)
                 .arg(data.stationLongitude)
                 .arg(data.observationDateTime.toString(Qt::ISODate));