Fix header -> subtitles_provider_manager.h

Originally committed to SVN as r1970.

Fix header -> subtitles_provider_manager.h
fc14717b · Amar Takhar · c501ae6e · fc14717b
--- a/aegisub/subtitles_provider_libass.h
+++ b/aegisub/subtitles_provider_libass.h
@@ -38,7 +38,7 @@

 #ifdef WITH_LIBASS

-#include "subtitles_provider.h"
+#include "subtitles_provider_manager.h"
 extern "C" {
 #ifdef __VISUALC__
 #include "stdint.h"