QtIFW

Small QString improvements.

Use QString::fromLatin1 instead of creating QLatin1String inside the
the QString constructor first. Remove some superfluous QStrings at all.

Change-Id: Icea93494c669ffa382fd5fbfacc6596383b4de21
Reviewed-by: Tim Jenssen <tim.jenssen@nokia.com>
Reviewed-by: Alexander Lenhardt <alexander.lenhardt@nokia.com>