Partially undo 0c4ed315

The classes in applets/kimpanel/backend/ibus/ibus15/ don't inherit from
anything, so the "override" keyword should not be used. Otherwise
all one gets is a compiler error.

CCMAIL: montel@kde.org

applets/kimpanel/backend/ibus/ibus15/enginemanager.h

@@ -30,7 +30,7 @@
 class EngineManager {
 public:
     EngineManager();
-    ~EngineManager() override;
+    virtual ~EngineManager();
 
     void setEngines(IBusEngineDesc** engines);
     IBusEngineDesc** engines() { return m_engines; }

applets/kimpanel/backend/ibus/ibus15/propertymanager.h

@@ -25,7 +25,7 @@
 class PropertyManager {
 public:
     PropertyManager();
-    ~PropertyManager() override;
+    virtual ~PropertyManager();
 
     void setProperties(IBusPropList* props);
     void updateProperty(IBusProperty* prop);