patch 8.2.2191: Vim9: using wrong name with lambda in nested function

Problem:    Vim9: using wrong name with lambda in nested function.
Solution:   Copy the lambda name earlier. (closes #7525)

src/testdir/test_vim9_func.vim

@@ -301,6 +301,19 @@ def Test_nested_global_function()
   CheckScriptFailure(lines, "E122:")
   delfunc g:Inner
 
+  lines =<< trim END
+      vim9script
+      def Outer()
+        def g:Inner()
+          echo map([1, 2, 3], {_, v -> v + 1})
+        enddef
+        g:Inner()
+      enddef
+      Outer()
+  END
+  CheckScriptSuccess(lines)
+  delfunc g:Inner
+
   lines =<< trim END
       vim9script
       def Func()