Remove setting we don't support yet.

package.json

@@ -58,11 +58,6 @@
                 "dart.sdkPath": {
                     "type": "string",
                     "description": "The location of the Dart SDK to use for analyzing and executing code. If blank, Dart-Code will attempt to find it from the PATH environment variable."
-                },
-                "dart.setIndentSettings": {
-                    "type": "boolean",
-                    "default": true,
-                    "description": "Forces indenting with two spaces when Dart files are opened. This is on by default because VS Code doesn't support per-language settings and most people use tabs/4 spaces for other languages."
                 }
             }
         }