gst1-plugins-ugly: fix variable name typo

The wrong variable name was used for the configure options.

Reported-by: Vincent Dehors <vincent.dehors@openwide.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

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

@@ -13,7 +13,7 @@ GST1_PLUGINS_UGLY_LICENSE = LGPLv2.1+
 
 GST1_PLUGINS_UGLY_CONF_OPTS = --disable-examples --disable-valgrind
 
-GST_PLUGINS_BAD1_CONF_OPTS += \
+GST1_PLUGINS_UGLY_CONF_OPTS += \
 	--disable-a52dec \
 	--disable-amrnb \
 	--disable-amrwb \