Always quit nicely no matter the plugin format

distrho/src/DistrhoPluginVST2.cpp

@@ -202,11 +202,6 @@ public:
 # endif
     }
 
-    ~UIVst()
-    {
-        fUI.quit();
-    }
-
     // -------------------------------------------------------------------
 
     void idle()

distrho/src/DistrhoUIInternal.hpp

@@ -107,6 +107,7 @@ public:
 
     ~UIExporter()
     {
+        quit();
         delete ui;
         delete uiData;
     }