DRASCULA: Fix color for Drascula at the end of chapter 5

I checked the original and the code in ScummVM and there is no
call to talk_solo in chapter 4, while we indeed need to use the red
color for all calls to talk_solo in chapter 5.

engines/drascula/talk.cpp

@@ -232,7 +232,7 @@ void DrasculaEngine::talk_solo(const char *said, const char *filename) {
 
 	if (currentChapter == 1)
 		color_abc(color_solo);
-	else if (currentChapter == 4)
+	else if (currentChapter == 5)
 		color_abc(kColorRed);
 
 	talkInit(filename);