Fix kv set with a closure argument (#15588)

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Fixes #15528 
# Description
Fixed `kv set` passing the pipeline input to the closure instead of the
value stored in that key.

# User-Facing Changes
Now `kv set` will pass the value in that key to the closure.

# Tests + Formatting


# After Submitting

crates/nu-std/std-rfc/kv/mod.nu

@@ -38,7 +38,7 @@ export def "kv set" [
   # If passed a closure, execute it
   let arg_type = ($value_or_closure | describe)
   let value = match $arg_type {
-    closure => { $input | do $value_or_closure }
+    closure => { kv get $key --universal=$universal | do $value_or_closure }
     _ => ($value_or_closure | default $input)
   }