refactor(propagateupload): explicit cast to avoid implicit int-to-double

Signed-off-by: Git'Fellow <12234510+solracsf@users.noreply.github.com>

Author: solracsf

src/libsync/propagateupload.cpp

@@ -736,7 +736,7 @@ void PropagateUploadFileCommon::adjustLastJobTimeout(AbstractNetworkJob *job, qi
 
     job->setTimeout(qBound(
         // Calculate 3 minutes for each gigabyte of data
-        qMin(thirtyMinutes - 1, qRound64(threeMinutes * fileSize / 1e9)),
+        qMin(thirtyMinutes - 1, qRound64(threeMinutes * static_cast<double>(fileSize) / 1e9)),
         job->timeoutMsec(),
         // Maximum of 30 minutes
         thirtyMinutes));