fix(platform/xilinx): correct option from -template to -app in Xilinx SDK setup

Replaces the incorrect `-template` option with `-app` for proper Xilinx SDK project configuration, resolving an issue introduced in the last commit.

platform/xilinx/util.tcl

@@ -310,7 +310,7 @@ proc _create_app {app_name app_config platform_name is_vitis} {
             -proc $cpu \
             -os $os \
             -lang $lang \
-            -template "$template"
+            -app "$template"
         _info "Application '$app_name' created for Xilinx SDK."
     }