Koenig - Fixed dash text expansions

refs https://github.com/TryGhost/Ghost/issues/9623
- ea2a6a09dc broke dash expansions because the list toggle was matching the `- ` before the dash text expansion could be triggered
- resolved by adding the missing beginning-of-string `^`

ghost/admin/lib/koenig-editor/addon/options/text-expansions.js

@@ -88,7 +88,7 @@ export default function (editor, koenig) {
     editor.unregisterTextInputHandler('ul');
     editor.onTextInput({
         name: 'md_ul',
-        match: /^\* |- /,
+        match: /^\* |^- /,
         run(editor, matches) {
             replaceWithListSection(editor, matches, 'ul');
         }