Use branch name in config

Elwig/Helpers/Config.cs

@@ -11,7 +11,7 @@ namespace Elwig.Helpers {
         private readonly string FileName;
         public string DatabaseFile = App.DataPath + "database.sqlite3";
         public string? DatabaseLog = null;
-        public string? ZwstId = null;
+        public string? Branch = null;
         public IEnumerable<string[]> Scales;
         private readonly LinkedList<string[]> ScaleList = new();
 
@@ -45,9 +45,9 @@ namespace Elwig.Helpers {
             }
 
             if (ini == null || !ini.TryGetKey("general.branch", out string branch)) {
-                ZwstId = null;
+                Branch = null;
             } else {
-                ZwstId = branch;
+                Branch = branch;
             }
 
             ScaleList.Clear();