Rename the remaining main.{h,cpp} to validation.{h,cpp}

src/zmq/zmqnotificationinterface.cpp

@@ -6,7 +6,7 @@
 #include "zmqpublishnotifier.h"
 
 #include "version.h"
-#include "main.h"
+#include "validation.h"
 #include "streams.h"
 #include "util.h"
 

src/zmq/zmqpublishnotifier.cpp

@@ -5,7 +5,7 @@
 #include "chainparams.h"
 #include "streams.h"
 #include "zmqpublishnotifier.h"
-#include "main.h"
+#include "validation.h"
 #include "util.h"
 
 static std::multimap<std::string, CZMQAbstractPublishNotifier*> mapPublishNotifiers;