package/gstreamer1/gst1-plugins-ugly: fix typo in mk file

BR2_PACKAGE_GST_PLUGINS_UGL1_PLUGIN_XINGMUX needs to be
BR2_PACKAGE_GST1_PLUGINS_UGLY_PLUGIN_XINGMUX

Signed-off-by: Adam Duskett <Aduskett@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit d2ada4d7045ba8b23824e10c59bb662c1cfd901c)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

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

@@ -46,7 +46,7 @@ else
 GST1_PLUGINS_UGLY_CONF_OPTS += --disable-dvdsub
 endif
 
-ifeq ($(BR2_PACKAGE_GST_PLUGINS_UGL1_PLUGIN_XINGMUX),y)
+ifeq ($(BR2_PACKAGE_GST1_PLUGINS_UGLY_PLUGIN_XINGMUX),y)
 GST1_PLUGINS_UGLY_CONF_OPTS += --enable-xingmux
 else
 GST1_PLUGINS_UGLY_CONF_OPTS += --disable-xingmux