Fix an exception when searching for a bug ID

The encode() function returns 'bytes' but that is useless and wrong in
our case, because we just need to get 'str' from 'DBus.String' to be
able to call the 'in' operator (the operator does not work for 'str' in
'DBus.String').

Related: rhbz#1211083, rhbz#1242080

Signed-off-by: Jakub Filak <jfilak@redhat.com>

src/gnome_abrt/views.py

@@ -105,7 +105,9 @@ def match(self, list_box_row):
                 if problems.Problem.Submission.URL != sbm.rtype:
                     continue
 
-                rid = sbm.data.encode('utf-8')
+                # _pattern is 'str' and sbm.data is 'dbus.String', so we need
+                # to convert sbm.data to a regular 'str'
+                rid = str(sbm.data)
                 rid = rid.rstrip('/').split('/')[-1].split('=')[-1]
                 if self._pattern in rid:
                     return True