allow quoted values in unnamed argument

public/scripts/slash-commands/SlashCommandParser.js

@@ -619,6 +619,13 @@ export class SlashCommandParser {
                     value = '';
                 }
                 listValues.push(this.parseClosure());
+            } else if (this.testQuotedValue()) {
+                isList = true;
+                if (value.length > 0) {
+                    listValues.push(value.trim());
+                    value = '';
+                }
+                listValues.push(this.parseQuotedValue());
             } else {
                 value += this.take();
             }