Remove redundant "== true" code

If it can be compared to a boolean, it can be evaluated as one in-place.

core/bind/core_bind.cpp

@@ -2487,7 +2487,7 @@ _Thread::~_Thread() {
 	if (active) {
 		ERR_EXPLAIN("Reference to a Thread object object was lost while the thread is still running...");
 	}
-	ERR_FAIL_COND(active == true);
+	ERR_FAIL_COND(active);
 }
 /////////////////////////////////////
 

core/dvector.h

@@ -149,7 +149,7 @@ class PoolVector {
 			}
 		}
 
-		if (old_alloc->refcount.unref() == true) {
+		if (old_alloc->refcount.unref()) {
 			//this should never happen but..
 
 #ifdef DEBUG_ENABLED

core/io/multiplayer_api.cpp

@@ -578,7 +578,7 @@ void MultiplayerAPI::_send_rpc(Node *p_from, int p_to, bool p_unreliable, bool p
 
 			network_peer->set_target_peer(E->get()); // To this one specifically.
 
-			if (F->get() == true) {
+			if (F->get()) {
 				// This one confirmed path, so use id.
 				encode_uint32(psc->id, &(packet_cache.write[1]));
 				network_peer->put_packet(packet_cache.ptr(), ofs);

core/variant.cpp

@@ -858,7 +858,7 @@ bool Variant::is_one() const {
 		// atomic types
 		case BOOL: {
 
-			return _data._bool == true;
+			return _data._bool;
 		} break;
 		case INT: {