fix(b-pagination): don't set initial page count twice (#6200)

src/components/pagination/pagination.js

@@ -49,8 +49,8 @@ export const BPagination = /*#__PURE__*/ Vue.extend({
       const result = mathCeil(sanitizeTotalRows(this.totalRows) / sanitizePerPage(this.perPage))
       return result < 1 ? 1 : result
     },
+    // Used for watching changes to `perPage` and `numberOfPages`
     pageSizeNumberOfPages() {
-      // Used for watching changes to `perPage` and `numberOfPages`
       return {
         perPage: sanitizePerPage(this.perPage),
         totalRows: sanitizeTotalRows(this.totalRows),
@@ -91,10 +91,6 @@ export const BPagination = /*#__PURE__*/ Vue.extend({
       })
     }
   },
-  mounted() {
-    // Set the initial page count
-    this.localNumberOfPages = this.numberOfPages
-  },
   methods: {
     // These methods are used by the render function
     onClick(event, pageNumber) {