Fix a compiler warning

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

source/frontend/pluginlist/pluginlistdialog.cpp

@@ -484,7 +484,7 @@ template <class T> inline T static_cast_void(const void* ptr)
 struct PluginInfoBytes {
     uint API;
     uint build;
-    uint type;
+    CARLA_BACKEND_NAMESPACE::PluginType type;
     uint hints;
     uint64_t uniqueId;
     uint audioIns;