Doc: remove Qt Simulator macro

The Qt Simulator is no longer mentioned in the docs.

Change-Id: I8730e45c75f2e69dadc053ebfa205aa7b6eef5fd
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>

doc/config/macros.qdocconf

@@ -21,7 +21,6 @@ macro.QD                = "Qt Designer"
 macro.QL                = "Qt Linguist"
 macro.QMLD              = "Qt Quick Designer"
 macro.QQV               = "Qt QML Viewer"
-macro.QS                = "Qt Simulator"
 macro.QSDK              = "Qt"
 macro.qtcversion        = $QTC_VERSION
 macro.param             = "\\e"