templates/layer.conf: remove backslash to enable bbappend setting

Remove the redundant backslash in template layer.conf file, otherwise,
the bbappend line setting wouldn't have effect, causing bbappend files
in these created layers not having any effect.

(From OE-Core rev: 7909b258ac87d4be9bb7aba00d12fd363bd9b248)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/bblayers/templates/layer.conf

@@ -2,7 +2,7 @@
 BBPATH .= ":${LAYERDIR}"
 
 # We have recipes-* directories, add to BBFILES
-BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \\
+BBFILES += "${LAYERDIR}/recipes-*/*/*.bb \
             ${LAYERDIR}/recipes-*/*/*.bbappend"
 
 BBFILE_COLLECTIONS += "%s"