fix: rebase the current branch onto the other one from the drop menu

The rebase entry passed the branches to the Rebase popup the wrong way
round, so it rebased the other branch onto the current one while the
menu text said the opposite.

Author: dakkafex

src/Views/BranchTree.axaml.cs

@@ -1551,7 +1551,7 @@ private async Task<ContextMenu> CreateContextMenuForBranchDropAsync(ViewModels.R
                 rebase.Click += (_, e) =>
                 {
                     if (repo.CanCreatePopup())
-                        repo.ShowPopup(new ViewModels.Rebase(repo, other, current));
+                        repo.ShowPopup(new ViewModels.Rebase(repo, current, other));
                     e.Handled = true;
                 };