qt5tools: fix typo in <pkg>_SOURCE

The QT5TOOLS_SOURCE variable uses mismatch QT5BASE_VERSION variable.

This commit fixes the typo by using the appropriate QT5TOOLS_VERSION
variable.

Signed-off-by: Gaël PORTAY <gael.portay@savoirfairelinux.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qt5/qt5tools/qt5tools.mk

@@ -6,7 +6,7 @@
 
 QT5TOOLS_VERSION = $(QT5_VERSION)
 QT5TOOLS_SITE = $(QT5_SITE)
-QT5TOOLS_SOURCE = qttools-opensource-src-$(QT5BASE_VERSION).tar.xz
+QT5TOOLS_SOURCE = qttools-opensource-src-$(QT5TOOLS_VERSION).tar.xz
 
 QT5TOOLS_DEPENDENCIES = qt5base
 QT5TOOLS_INSTALL_STAGING = YES