normalize default_config/env formatting (#9731)

# Description

This PR just tried to normalize the formatting. Everything should be 4
spaces now for those people that can't live with 2 spaces in the default
config files. I also remove some unneeded line breaks and changed two
places that should've been `edit` vs `send`.

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crates/nu-utils/src/sample_config/default_env.nu

@@ -58,14 +58,14 @@ $env.PROMPT_MULTILINE_INDICATOR = {|| "::: " }
 # - converted from a value back to a string when running external commands (to_string)
 # Note: The conversions happen *after* config.nu is loaded
 $env.ENV_CONVERSIONS = {
-  "PATH": {
-    from_string: { |s| $s | split row (char esep) | path expand --no-symlink }
-    to_string: { |v| $v | path expand --no-symlink | str join (char esep) }
-  }
-  "Path": {
-    from_string: { |s| $s | split row (char esep) | path expand --no-symlink }
-    to_string: { |v| $v | path expand --no-symlink | str join (char esep) }
-  }
+    "PATH": {
+        from_string: { |s| $s | split row (char esep) | path expand --no-symlink }
+        to_string: { |v| $v | path expand --no-symlink | str join (char esep) }
+    }
+    "Path": {
+        from_string: { |s| $s | split row (char esep) | path expand --no-symlink }
+        to_string: { |v| $v | path expand --no-symlink | str join (char esep) }
+    }
 }
 
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