Run Scout task with the user's home directory

If no workspace folder has been opened then the task cannot run because
it does not know which folder to use as the working directory. In this
case, we should just use the user's home directory.

Signed-off-by: Remy Suen <remy.suen@docker.com>

Author: rcjsuen

package-lock.json

@@ -21,7 +21,7 @@
   },
   "dependencies": {
     "dockerfile-language-service": "0.14.0",
-    "dockerfile-utils": "0.16.1",
+    "dockerfile-utils": "0.16.2",
     "vscode-languageserver": "~8.0.0",
     "vscode-languageserver-textdocument": "~1.0.8"
   },