unref dbus connection on close

Signed-off-by: falkTX <falktx@falktx.com>

distrho/DistrhoUI_macOS.mm

@@ -27,7 +27,7 @@
 # include <algorithm>
 # include <cmath>
 # ifndef DGL_FILE_BROWSER_DISABLED
-#  include "../extra/FileBrowserDialog.cpp"
+#  include "extra/FileBrowserDialog.cpp"
 # endif
 
 // Declared in DistrhoUI.cpp but defined here because it uses Obj-C

distrho/extra/FileBrowserDialog.cpp

@@ -232,6 +232,8 @@ struct FileBrowserData {
         [nsBasePanel release];
 #endif
 #ifdef HAVE_X11
+        if (dbuscon != nullptr)
+            dbus_connection_unref(dbuscon);
         if (x11display != nullptr)
             XCloseDisplay(x11display);
 #endif