Fix taglib includes

FindTaglib reports <prefix>/include/taglib/ as include path, so we must
not prefix the headers with taglib/

src/models/chaptermodel.cpp

@@ -11,7 +11,7 @@
 #include <QObject>
 #include <QSqlQuery>
 
-#include <taglib/chapterframe.h>
+#include <chapterframe.h>
 
 #include "database.h"
 

src/models/chaptermodel.h

@@ -9,7 +9,7 @@
 #include <KFormat>
 #include <QAbstractListModel>
 
-#include <taglib/mpegfile.h>
+#include <mpegfile.h>
 
 struct ChapterEntry {
     QString title;