Qbs: Pass related info directly to command line creation function

Saves a few casts and otherwise unneeded accessors.

Change-Id: I7a6ff1e8348a24690f35e69d300463a6c5c18867
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/qbsprojectmanager/qbscleanstep.cpp

@@ -67,8 +67,12 @@ QbsCleanStep::QbsCleanStep(BuildStepList *bsl, Core::Id id)
     effectiveCommandAspect->setLabelText(tr("Equivalent command line:"));
 
     setSummaryUpdater([this, effectiveCommandAspect] {
+        QbsBuildStepData data;
+        data.command = "clean";
+        data.dryRun = m_dryRunAspect->value();
+        data.keepGoing = m_keepGoingAspect->value();
         QString command = static_cast<QbsBuildConfiguration *>(buildConfiguration())
-                 ->equivalentCommandLine(this);
+                 ->equivalentCommandLine(data);
         effectiveCommandAspect->setValue(command);
         return tr("<b>Qbs:</b> %1").arg(command);
     });