general: Fix missing notifyCategoryProxy.h includes

pandatool/src/assimp/config_assimp.h

@@ -15,6 +15,7 @@
 #define CONFIG_ASSIMP_H
 
 #include "pandatoolbase.h"
+#include "notifyCategoryProxy.h"
 #include "configVariableBool.h"
 #include "configVariableDouble.h"
 #include "dconfig.h"

pandatool/src/ptloader/config_ptloader.h

@@ -15,7 +15,7 @@
 #define CONFIG_PTLOADER_H
 
 #include "pandatoolbase.h"
-
+#include "notifyCategoryProxy.h"
 #include "dconfig.h"
 #include "distanceUnit.h"
 #include "configVariableEnum.h"