Remove runner flow: Change from PAT to "deletion token" in prompt (#225)

* Updating prompt deletion token

Currently if you leave the token off the command, we're showing "Enter your personal access token:"

Which won't work. This updates prompt to "deletion token"

* Call correct function in test

* Fix command text in test

src/Runner.Listener/CommandSettings.cs

@@ -224,6 +224,15 @@ namespace GitHub.Runner.Listener
                 validator: Validators.NonEmptyValidator);
         }
 
+        public string GetRunnerDeletionToken()
+        {
+            return GetArgOrPrompt(
+                name: Constants.Runner.CommandLine.Args.Token,
+                description: "Enter runner deletion token:",
+                defaultValue: string.Empty,
+                validator: Validators.NonEmptyValidator);
+        }
+
         public string GetUrl(bool suppressPromptIfEmpty = false)
         {
             // Note, GetArg does not consume the arg (like GetArgOrPrompt does).