Fix Analytics Author filters

This fix is for MR Analytics Assignees and
Author as well as VSA assignees.

Changelog: fixed

app/assets/javascripts/cycle_analytics/components/filter_bar.vue

@@ -79,7 +79,6 @@ export default {
           title: __('Assignees'),
           type: 'assignees',
           token: AuthorToken,
-          defaultAuthors: [],
           initialAuthors: this.assigneesData,
           unique: false,
           operators: OPERATOR_IS_ONLY,

ee/app/assets/javascripts/analytics/merge_request_analytics/components/filter_bar.vue

@@ -86,7 +86,6 @@ export default {
           title: __('Author'),
           type: 'author',
           token: AuthorToken,
-          defaultAuthors: [],
           initialAuthors: this.authorsData,
           unique: true,
           operators: OPERATOR_IS_ONLY,
@@ -97,7 +96,6 @@ export default {
           title: __('Assignee'),
           type: 'assignee',
           token: AuthorToken,
-          defaultAuthors: [],
           initialAuthors: this.assigneesData,
           unique: false,
           operators: OPERATOR_IS_ONLY,