use 1-based for group output

Author: Lunaretic

xivModdingFramework/Mods/FileTypes/PMP.cs

@@ -743,7 +743,7 @@ public static async Task WritePmp(PMPJson pmp, string workingDirectory, string z
             for(int i = 0; i < pmp.Groups.Count; i++)
             {
                 var gName = IOUtil.MakePathSafe(pmp.Groups[i].Name.ToLower());
-                var groupPath = Path.Combine(workingDirectory, "group_" + i.ToString("D3") + "_" + gName + ".json");
+                var groupPath = Path.Combine(workingDirectory, "group_" + (i+1).ToString("D3") + "_" + gName + ".json");
                 var groupString = JsonConvert.SerializeObject(pmp.Groups[i], Formatting.Indented);
                 File.WriteAllText(groupPath, groupString);
             }