Add clear console when starting gamemode setting.

Signed-off-by: sphrose <82213493+sphrose@users.noreply.github.com>

Code/Editor/Controls/ConsoleSCB.h

@@ -174,6 +174,8 @@ public:
 
     static void AddToPendingLines(const QString& text, bool bNewLine);        // call this function instead of AddToConsole() until an instance of CConsoleSCB exists to prevent messages from getting lost
 
+    void ClearText();
+
     // EditorPreferencesNotificationBus...
     void OnEditorPreferencesChanged() override;