HaikuDepot: Only allow single pkg selection

Solves issue #10676

Change-Id: Ic0bfbb79114f1ed5b725b0c3dfa4e40943395c17
Reviewed-on: https://review.haiku-os.org/c/haiku/+/10246
Reviewed-by: Kacper Kasper <[email protected]>
Reviewed-by: Jérôme Duval <[email protected]>

src/apps/haikudepot/ui/PackageListView.cpp

@@ -1125,6 +1125,7 @@ PackageListView::PackageListView(Model* model)
 
 	fItemCountView = new ItemCountView();
 	AddStatusView(fItemCountView);
+	SetSelectionMode(B_SINGLE_SELECTION_LIST);
 }