ProjectExplorer: Remove RunWorker::setDisplayName

It has been an obsolete alias for setId for a while and downstream
uses have been adapted.

Change-Id: I467370aa67054599c7771e8275d28e62ddc461fa
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/remotelinux/remotelinuxdebugsupport.cpp

@@ -36,7 +36,7 @@ namespace Internal {
 LinuxDeviceDebugSupport::LinuxDeviceDebugSupport(RunControl *runControl)
     : DebuggerRunTool(runControl)
 {
-    setDisplayName("LinuxDeviceDebugSupport");
+    setId("LinuxDeviceDebugSupport");
 
     setUsePortsGatherer(isCppDebugging(), isQmlDebugging());
     addQmlServerInferiorCommandLineArgumentIfNeeded();