Switch from pretty-simple to pretty-show for native output.

Update tests.

Reason:  it turns out that the native output generated by
pretty-simple isn't always readable by the native reader.
According to https://github.com/cdepillabout/pretty-simple/issues/99
it is not a design goal of the library that the rendered values
be readable using 'read'.  This makes it unsuitable for our
purposes.

pretty-show is a bit slower and it uses 4-space indents
(non-configurable), but it doesn't have this serious drawback.

1 files changed, 11 insertions, 12 deletions

diff --git a/test/command/4306.md b/test/command/4306.md
index 3f5caa8fc..dcb90e312 100644
--- a/test/command/4306.md
+++ b/test/command/4306.md
@@ -7,17 +7,16 @@ The file id is \nolinkurl{ESP_123_5235}.
 \end{document}
 ^D
 [ Para
-  [ Str "The"
-  , Space
-  , Str "file"
-  , Space
-  , Str "id"
-  , Space
-  , Str "is"
-  , Space
-  , Code
-    ( "", [], [] ) "ESP_123_5235"
-  , Str "."
-  ]
+    [ Str "The"
+    , Space
+    , Str "file"
+    , Space
+    , Str "id"
+    , Space
+    , Str "is"
+    , Space
+    , Code ( "" , [] , [] ) "ESP_123_5235"
+    , Str "."
+    ]
 ]
 ```