package/opencv4-contrib: fix INSTALL_TARGET value

The variable should be a YES/NO value, FALSE is not a valid value.
E.g. the yesno-to-bool cmd does not translate a FALSE value and therefore returns invalid JSON.

Signed-off-by: Maximilian Senftleben <maximilian.senftleben@frogblue-tec.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/opencv4-contrib/opencv4-contrib.mk

@@ -6,7 +6,7 @@
 
 OPENCV4_CONTRIB_VERSION = 4.8.1
 OPENCV4_CONTRIB_SITE = $(call github,opencv,opencv_contrib,$(OPENCV4_CONTRIB_VERSION))
-OPENCV4_CONTRIB_INSTALL_TARGET = FALSE
+OPENCV4_CONTRIB_INSTALL_TARGET = NO
 OPENCV4_CONTRIB_LICENSE = Apache-2.0
 OPENCV4_CONTRIB_LICENSE_FILES = LICENSE