package/gstreamer1/gst1-plugins-ugly: add missing comma in license variable

When one GPL-licensed plugin was enabled, the license of
gst1-plugins-ugly would be "LGPL-2.1+ GPL-2.0", but licenses should be
comma separated, not space separated. So let's fix that to get the
expected value of "LGPL-2.1+, GPL-2.0".

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 4626bafe5ccd91fdcc84f2413ad23404942672f4)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/gstreamer1/gst1-plugins-ugly/gst1-plugins-ugly.mk

@@ -89,7 +89,7 @@ endif
 
 # Add GPL license if GPL plugins enabled.
 ifeq ($(GST1_PLUGINS_UGLY_HAS_GPL_LICENSE),y)
-GST1_PLUGINS_UGLY_LICENSE += GPL-2.0
+GST1_PLUGINS_UGLY_LICENSE += , GPL-2.0
 endif
 
 # Use the following command to extract license info for plugins.