Fixed include case sensitive name include

Author: AdelKS

Windows/mainwindow.h

@@ -24,7 +24,7 @@
 #ifndef ZEGRAPHER_H
 #define ZEGRAPHER_H
 
-#include "Structures.h"
+#include "structures.h"
 #include "GraphDraw/maingraph.h"
 #include "Windows/rangeadjustments.h"
 #include "Windows/mathobjectsinput.h"

Windows/settings.h

@@ -24,7 +24,7 @@
 #ifndef SETTINGS_H
 #define SETTINGS_H
 
-#include "Structures.h"
+#include "structures.h"
 #include "information.h"
 #include "Widgets/qcolorbutton.h"