Missed a header change in the OpenAL header.

Originally committed to SVN as r1963.

Missed a header change in the OpenAL header.
7c4c825c · Amar Takhar · 576dd457 · 7c4c825c
--- a/aegisub/audio_player_openal.h
+++ b/aegisub/audio_player_openal.h
@@ -45,7 +45,7 @@
 #include "utils.h"
 #include "main.h"
 #include "frame_main.h"
-#include "audio_player.h"
+#include "audio_player_manager.h"
 #include "options.h"
 #ifdef __WINDOWS__