fix: Remove invalid %desc specifier from DatedFormat

Since the %desc is not supported by guessit, it would always be empty.
Furthermore no documentation was provided and all dated test cases used it.

The specifier was removed and the test cases adjusted accordingly.

See: nzbget#52

VideoSort.py

@@ -901,11 +901,6 @@ def add_dated_mapping(guess, mapping):
     mapping.append(('%s.N', show_name_two))
     mapping.append(('%s_N', show_name_three))
 
-    # Guessit doesn't provide episode names for dated tv shows
-    mapping.append(('%desc', ''))
-    mapping.append(('%.desc', ''))
-    mapping.append(('%_desc', ''))
-
     # date
     date = guess.get('date')
 

testdata.json

@@ -122,13 +122,13 @@
     "id": "dated-1",
     "INPUTFILE": "The.Daily.Show.2013.06.27.Tom.Goldstein.HDTV.x264-FQM.mkv",
     "OUTPUTFILE": "/dated/2013-06/The Daily Show - 2013-6-27.mkv",
-    "NZBPO_DATEDFORMAT": "%y-%0m/%t - %y-%m-%0d - %desc.%ext"
+    "NZBPO_DATEDFORMAT": "%y-%0m/%t - %y-%m-%0d.%ext"
   },
   {
     "id": "dated-2",
     "INPUTFILE": "Real.Time.with.Bill.Maher.2014.10.31.720p.HDTV.x264-BATV.mkv",
     "OUTPUTFILE": "/dated/2014-10/Real Time With Bill Maher - 2014-10-31.mkv",
-    "NZBPO_DATEDFORMAT": "%y-%0m/%t - %y-%m-%0d - %desc.%ext"
+    "NZBPO_DATEDFORMAT": "%y-%0m/%t - %y-%m-%0d.%ext"
   },
   {
     "id": "dated-case-correct",