package/wpewebkit: fix gstreamer-gl dependency

package/wpewebkit: fix gstreamer-gl dependency

The gstreamer1 opengl plugin was moved from gst1-plugins-bad to
gst1-plugins-base so we need to update wpewebkit to depend on the
correct package.

Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Reviewed-by: Adrian Perez de Castro <aperez@igalia.com>
[Thomas: don't add gst1-plugins-base to the DEPENDENCIES variable when
BR2_PACKAGE_WPEWEBKIT_USE_GSTREAMER_GL is enabled, because it's
already added when BR2_PACKAGE_WPEWEBKIT_MULTIMEDIA=y, and
BR2_PACKAGE_WPEWEBKIT_USE_GSTREAMER_GL depends on
BR2_PACKAGE_WPEWEBKIT_MULTIMEDIA.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>