package/zxing-cpp: update homepage

Commit 456a7398316655ad0b669635f580e4887c24a700 decided to switch to an
active fork but forgot to update homepage in Config.in

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/zxing-cpp/Config.in

@@ -13,4 +13,4 @@ config BR2_PACKAGE_ZXING_CPP
 	  implemented in Java, with ports to other languages. This
 	  compiles the C++ port.
 
-	  https://github.com/glassechidna/zxing-cpp
+	  https://github.com/zxing-cpp/zxing-cpp