AutoPilotPlugin: Add missing const in member functions

Signed-off-by: Patrick José Pereira <patrickelectric@gmail.com>

src/AutoPilotPlugins/AutoPilotPlugin.cc

@@ -51,7 +51,7 @@ void AutoPilotPlugin::_recalcSetupComplete(void)
     }
 }
 
-bool AutoPilotPlugin::setupComplete(void)
+bool AutoPilotPlugin::setupComplete(void) const
 {
     return _setupComplete;
 }

src/AutoPilotPlugins/AutoPilotPlugin.h

@@ -51,7 +51,7 @@ public:
     Q_INVOKABLE virtual QString prerequisiteSetup(VehicleComponent* component) const = 0;
 
     // Property accessors
-    bool setupComplete(void);
+    bool setupComplete(void) const;
 
 signals:
     void setupCompleteChanged(bool setupComplete);