Revert "FIX: fixnum type site setting can't be more than 20000"

This reverts commit 636cc66e1f.

lib/site_setting_extension.rb

@@ -310,8 +310,8 @@ module SiteSettingExtension
     type = get_data_type(name, defaults[name.to_sym])
 
     if type == types[:fixnum]
-      # value should be less than 20000
-      valid = false if value.to_i > 20000
+      # validate fixnum
+      valid = false unless value.to_i.is_a?(Fixnum)
     end
 
     return valid

spec/components/site_setting_extension_spec.rb

@@ -340,12 +340,12 @@ describe SiteSettingExtension do
     end
   end
 
-  describe "set for an invalid fixnum value (greater than 20000)" do
+  describe "set for an invalid fixnum value" do
     it "raises an error" do
       settings.setting(:test_setting, 80)
       settings.refresh!
       expect {
-        settings.set("test_setting", 20001)
+        settings.set("test_setting", 9999999999999999999)
       }.to raise_error(ArgumentError)
     end
   end