Fix FSAA dropdown option reset after changing another dropdown option

builtin/mainmenu/tab_settings.lua

@@ -95,7 +95,7 @@ end
 
 local function getAntialiasingSettingIndex()
 	local antialiasing_setting = core.setting_get("fsaa")
-	for i=1, #(antialiasing[2]) do
+	for i = 1, #(antialiasing[2]) do
 		if antialiasing_setting == antialiasing[2][i] then
 			return i
 		end
@@ -104,13 +104,12 @@ local function getAntialiasingSettingIndex()
 end
 
 local function antialiasing_fname_to_name(fname)
-   for i=1, #(dd_antialiasing_labels) do
+	for i = 1, #(dd_antialiasing_labels) do
 		if fname == dd_antialiasing_labels[i] then
 			return antialiasing[2][i]
 		end
 	end
-
+	return 0
-   return "0"
 end
 
 local function dlg_confirm_reset_formspec(data)
@@ -418,8 +417,11 @@ local function handle_settings_buttons(this, fields, tabname, tabdata)
 		core.setting_set("anisotropic_filter", "true")
 		ddhandled = true
 	end
+	if fields["dd_antialiasing"] then
 		core.setting_set("fsaa",
 			antialiasing_fname_to_name(fields["dd_antialiasing"]))
+		ddhandled = true
+	end
 
 	return ddhandled
 end