qt5webkit: fix typo in the <pkg>_DEPENDENCIES declaration

This commit fixes a typo introduced in commit
43e1d099b4fca37ce7cbbf3dd41fe4330610b723 ("Revert
"package/qt5webkit-examples: remove obsolete package""), which caused
qt5declarative to not be added as a dependency for the correct
package.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/qt5/qt5webkit-examples/qt5webkit-examples.mk

@@ -39,7 +39,7 @@ define QT5WEBKIT_EXAMPLES_INSTALL_STAGING_CMDS
 endef
 
 ifeq ($(BR2_PACKAGE_QT5DECLARATIVE),y)
-QT5WEBKIT_DEPENDENCIES += qt5declarative
+QT5WEBKIT_EXAMPLES_DEPENDENCIES += qt5declarative
 define QT5WEBKIT_EXAMPLES_INSTALL_QML
 	cp -dpfr $(@D)/examples/webkitqml $(TARGET_DIR)/usr/lib/qt/examples
 endef