libtwrpgui: convert gui to use new ziparchive library

Change-Id: Iea94855257c6d02c2f663c25d390cb1cfb91a727
diff --git a/gui/slidervalue.cpp b/gui/slidervalue.cpp
index 5ed9c4f..8deb9e0 100755
--- a/gui/slidervalue.cpp
+++ b/gui/slidervalue.cpp
@@ -38,8 +38,8 @@
 extern "C" {
 #include "../twcommon.h"
 }
-#include "../minuitwrp/minui.h"
-#include "../minuitwrp/truetype.hpp"
+#include "minuitwrp/minui.h"
+#include "minuitwrp/truetype.hpp"
 
 #include "rapidxml.hpp"
 #include "objects.hpp"