QbsProjectManager: Turn the timestamp check off by default.

One line was overlooked in a recent patch that intended to do this.

Change-Id: I1c344c4e25d47b2c4cc89071c2a4e059b451c9fd
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>

src/plugins/qbsprojectmanager/qbsbuildstep.cpp

@@ -71,7 +71,6 @@ QbsBuildStep::QbsBuildStep(ProjectExplorer::BuildStepList *bsl) :
 {
     setDisplayName(tr("Qbs Build"));
     setQbsConfiguration(QVariantMap());
-    m_qbsBuildOptions.setForceTimestampCheck(true);
 }
 
 QbsBuildStep::QbsBuildStep(ProjectExplorer::BuildStepList *bsl, const QbsBuildStep *other) :