package_manager.py: fix the message used to catch failing postinsts from dnf

Latest dnf versions have tweaked it.

(From OE-Core rev: 477db7cf4a6a0d06554c9d1539a01fed7c5cb389)

Signed-off-by: Alexander Kanavin <alex.kanavin@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oe/package_manager.py

@@ -864,7 +864,7 @@ class RpmPM(PackageManager):
 
         failed_scriptlets_pkgnames = collections.OrderedDict()
         for line in output.splitlines():
-            if line.startswith("Non-fatal POSTIN scriptlet failure in rpm package"):
+            if line.startswith("Error in POSTIN scriptlet in rpm package"):
                 failed_scriptlets_pkgnames[line.split()[-1]] = True
 
         if len(failed_scriptlets_pkgnames) > 0: