message: Fix columns in SettingsSchema.md Profiles section
  The `Description` for `selectionBackground` in the Profiles section was in the `Default` column, add an empty default column to fix this.
diff: @@ -43,7 +43,7 @@ Properties listed below are specific to each unique profile.
  | `icon` | Optional | String | | Image file location of the icon used in the profile. Displays within the tab and the dropdown menu. |
  | `padding` | Optional | String | `8, 8, 8, 8` | Sets the padding around the text within the window. Can have three different formats: `"#"` sets the same padding for all sides, `"#, #"` sets the same padding for left-right and top-bottom, and `"#, #, #, #"` sets the padding individually for left, top, right, and bottom. |
  | `scrollbarState` | Optional | String | | Defines the visibility of the scrollbar. Possible values: `"visible"`, `"hidden"` |
  -| `selectionBackground` | Optional | String | Sets the selection background color of the profile. Overrides `selectionBackground` set in color scheme if `colorscheme` is set. Uses hex color format: `"#rrggbb"`. |
  +| `selectionBackground` | Optional | String | | Sets the selection background color of the profile. Overrides `selectionBackground` set in color scheme if `colorscheme` is set. Uses hex color format: `"#rrggbb"`. |
  | `snapOnInput` | Optional | Boolean | `true` | When set to `true`, the window will scroll to the command input line when typing. When set to `false`, the window will not scroll when you start typing. |
  | `source` | Optional | String | | Stores the name of the profile generator that originated this profile. _There are no discoverable values for this field._ |
  | `startingDirectory` | Optional | String | `%USERPROFILE%` | The directory the shell starts in when it is loaded. |
  