enhance: use -B instead of -b to support creating worktree with existed branch (#205)

src/Commands/Worktree.cs

@@ -70,7 +70,7 @@ namespace SourceGit.Commands
                 Args += "--track ";
 
             if (!string.IsNullOrEmpty(name))
-                Args += $"-b {name} ";
+                Args += $"-B {name} ";
 
             Args += $"\"{fullpath}\" ";
 

src/Views/Launcher.axaml.cs

@@ -11,8 +11,6 @@ namespace SourceGit.Views
     {
         public Launcher()
         {
-            InitializeComponent();
-
             var layout = ViewModels.Preference.Instance.Layout;
             WindowState = layout.LauncherWindowState;
 
@@ -21,6 +19,8 @@ namespace SourceGit.Views
                 Width = layout.LauncherWidth;
                 Height = layout.LauncherHeight;
             }
+
+            InitializeComponent();
         }
 
         protected override void OnPropertyChanged(AvaloniaPropertyChangedEventArgs change)