Make default config more consistent (#13399)

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# Description
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Fixes some minor config inconsistencies:
- Add default value for `shape_glob_interpolation` to light theme, as it
is missing
- Add right padding space to `shape_garbage` options
- Use a integer value for `footer_mode` instead of a string
- Set `buffer_editor` to null instead of empty string

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

@@ -47,7 +47,7 @@ let dark_theme = {
     shape_flag: blue_bold
     shape_float: purple_bold
     # shapes are used to change the cli syntax highlighting
-    shape_garbage: { fg: white bg: red attr: b}
+    shape_garbage: { fg: white bg: red attr: b }
     shape_glob_interpolation: cyan_bold
     shape_globpattern: cyan_bold
     shape_int: purple_bold
@@ -114,7 +114,8 @@ let light_theme = {
     shape_flag: blue_bold
     shape_float: purple_bold
     # shapes are used to change the cli syntax highlighting
-    shape_garbage: { fg: white bg: red attr: b}
+    shape_garbage: { fg: white bg: red attr: b }
+    shape_glob_interpolation: cyan_bold
     shape_globpattern: cyan_bold
     shape_int: purple_bold
     shape_internalcall: cyan_bold
@@ -226,9 +227,9 @@ $env.config = {
 
     color_config: $dark_theme # if you want a more interesting theme, you can replace the empty record with `$dark_theme`, `$light_theme` or another custom record
     use_grid_icons: true
-    footer_mode: "25" # always, never, number_of_rows, auto
+    footer_mode: 25 # always, never, number_of_rows, auto
     float_precision: 2 # the precision for displaying floats in tables
-    buffer_editor: "" # command that will be used to edit the current line buffer with ctrl+o, if unset fallback to $env.EDITOR and $env.VISUAL
+    buffer_editor: null # command that will be used to edit the current line buffer with ctrl+o, if unset fallback to $env.EDITOR and $env.VISUAL
     use_ansi_coloring: true
     bracketed_paste: true # enable bracketed paste, currently useless on windows
     edit_mode: emacs # emacs, vi
@@ -888,4 +889,4 @@ $env.config = {
             event: { edit: selectall }
         }
     ]
-}
+}