ProjectExplorer: Remove unused Runnable::displayName

Change-Id: Iae9377f1d4f555a666fb523dda0972ac541c2aa2
Reviewed-by: Jarek Kobus <jaroslaw.kobus@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/projectexplorer/runcontrol.cpp

@@ -1906,11 +1906,6 @@ void RunWorker::stop()
     reportStopped();
 }
 
-QString Runnable::displayName() const
-{
-    return command.executable().toString();
-}
-
 // OutputFormatterFactory
 
 static QList<OutputFormatterFactory *> g_outputFormatterFactories;

src/plugins/projectexplorer/runcontrol.h

@@ -73,9 +73,6 @@ public:
     Utils::Environment environment;
     IDeviceConstPtr device; // Override the kit's device. Keep unset by default.
     QVariantHash extraData;
-
-    // FIXME: Not necessarily a display name
-    QString displayName() const;
 };
 
 class PROJECTEXPLORER_EXPORT RunWorker : public QObject