[ruby/prism] Fix up locals test with it parameters

ruby/prism@599a96dbfc

Author: kddnewton

test/prism/locals_test.rb

@@ -147,7 +147,7 @@ def prism_locals(source)
           elsif node.parameters.is_a?(NumberedParametersNode)
             # nothing
           elsif node.parameters.is_a?(ItParametersNode)
-            names << AnonymousLocal
+            names.unshift(AnonymousLocal)
           else
             params = node.parameters&.parameters
           end