package/chartjs: fix license path
Commit a954d39a58 ("package/chartjs: bump to version 3.9.1") updated the
package version and the license file hash, but also changed the path to
the license file in the hash file. However, the path to the license file
hasn't changed, causing an error during "make legal-info". Revert the
path change.
Signed-off-by: Florian Larysch <fl@n621.de>
Signed-off-by: Julien Olivain <ju.o@free.fr>