package/datatables: drop spurious space

Drop spurious space added by commit
3995a68e2103a484f089c98b8d6ce9a81081762f

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/datatables/datatables.mk

@@ -6,7 +6,7 @@
 
 DATATABLES_VERSION = 1.10.20
 DATATABLES_SITE = https://datatables.net/releases
-DATATABLES_SOURCE =  DataTables-$(DATATABLES_VERSION).zip
+DATATABLES_SOURCE = DataTables-$(DATATABLES_VERSION).zip
 DATATABLES_LICENSE = MIT
 DATATABLES_LICENSE_FILES = license.txt