corrected a #*$£& value that created a shift in the borders rendering

src/level.cpp

@@ -201,11 +201,11 @@ Border* Level::MakeBorder( libnum::num DX, libnum::num DY, float x1, float y1, f
 {
     Border *Bord = new Border();
 
-    Bord->A.x = DX + libnum::num(x1*16.0);
-    Bord->A.y = DY + libnum::num(y1*16.0);
+    Bord->A.x = DX + libnum::num(x1*15.0);
+    Bord->A.y = DY + libnum::num(y1*15.0);
 
-    Bord->B.x = DX + libnum::num(x2*16.0);
-    Bord->B.y = DY + libnum::num(y2*16.0);
+    Bord->B.x = DX + libnum::num(x2*15.0);
+    Bord->B.y = DY + libnum::num(y2*15.0);
 
     Bord->N.x = Bord->A.y - Bord->B.y;
     Bord->N.y = Bord->B.x - Bord->A.x;