Remove redundant EXPECT_CALL

The original `EXPECT_CALL` already has an implicit `Times(1)`, so there is no need for a second `EXPECT_CALL` with an explicit `Times(0)`.

This also removes an `EXPECT_CALL` after a call to a mock handler, which would be undefined behavior. Thus this removes the undefined behavior.

test/Signal/Signal.test.cpp

@@ -28,6 +28,5 @@ TEST(Signal, ConnectEmitDisconnect) {
 	signal.disconnect(delegate);
 	EXPECT_TRUE(signal.empty());
 
-	EXPECT_CALL(handler, MockMethod()).Times(0);
 	signal.emit();
 }