fix unit test of defaults since we deleted one global default

I'm afraid this unit test is not maintainable, each time we
change the structure of the defaults.lua we must change this spec
accordingly. We probably will get rid of defaults.lua as well as the
filemanagersetdefaults and this spec.

spec/unit/defaults_spec.lua

@@ -8,8 +8,8 @@ describe("defaults module", function()
 
     it("should load all defaults from defaults.lua", function()
         Defaults:init()
-        assert.is_same(#Defaults.defaults_name, 78)
-        assert.is_same(Defaults.defaults_name[29], 'DHINTCOUNT')
+        assert.is_same(#Defaults.defaults_name, 77)
+        assert.is_same(Defaults.defaults_name[28], 'DHINTCOUNT')
     end)
 
     it("should save changes to defaults.persistent.lua", function()
@@ -19,14 +19,14 @@ describe("defaults module", function()
         -- not in persistent but checked in defaults
         Defaults.changed[14] = true
         Defaults.changed[19] = true
-        Defaults.changed[29] = true
-        Defaults.changed[64] = true
-        Defaults.changed[78] = true
+        Defaults.changed[28] = true
+        Defaults.changed[63] = true
+        Defaults.changed[77] = true
         Defaults:SaveSettings()
-        assert.is_same(#Defaults.defaults_name, 78)
-        assert.is_same(Defaults.defaults_name[29], 'DHINTCOUNT')
-        assert.is_same(Defaults.defaults_name[78], 'SEARCH_TITLE')
-        assert.is_same(Defaults.defaults_name[64], 'DTAP_ZONE_MENU')
+        assert.is_same(#Defaults.defaults_name, 77)
+        assert.is_same(Defaults.defaults_name[28], 'DHINTCOUNT')
+        assert.is_same(Defaults.defaults_name[77], 'SEARCH_TITLE')
+        assert.is_same(Defaults.defaults_name[63], 'DTAP_ZONE_MENU')
         assert.is_same(Defaults.defaults_name[19], 'DCREREADER_VIEW_MODE')
         assert.is_same(Defaults.defaults_name[14],
                        'DCREREADER_CONFIG_MARGIN_SIZES_LARGE')
@@ -54,10 +54,10 @@ DTAP_ZONE_MENU = {
 
         -- in persistent
         Defaults:init()
-        Defaults.changed[29] = true
-        Defaults.defaults_value[29] = 2
-        Defaults.changed[64] = true
-        Defaults.defaults_value[64] = {
+        Defaults.changed[28] = true
+        Defaults.defaults_value[28] = 2
+        Defaults.changed[63] = true
+        Defaults.defaults_value[63] = {
             y = 10,
             x = 10.125,
             h = 20.25,
@@ -107,8 +107,8 @@ DHINTCOUNT = 2
 
         -- in persistent
         Defaults:init()
-        Defaults.changed[29] = true
-        Defaults.defaults_value[29] = 1
+        Defaults.changed[28] = true
+        Defaults.defaults_value[28] = 1
         Defaults:SaveSettings()
         fd = io.open(persistent_filename)
         assert.Equals(