packagedata: Fix after override syntax change

Fix a reference that should have been part of the override syntax change
causing packages to be written out incorrectly.

(From OE-Core rev: 0f978b4f03e71267ad0a8a5054141e7727f2944f)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/packagedata.bbclass

@@ -27,7 +27,7 @@ python read_subpackage_metadata () {
             # of that variable, e.g. DESCRIPTION could clobber DESCRIPTION:<pkgname>
             # We therefore don't clobber for the unsuffixed variable versions
             #
-            if key.endswith("_" + pkg):
+            if key.endswith(":" + pkg):
                 d.setVar(key, sdata[key])
             else:
                 d.setVar(key, sdata[key], parsing=True)