
**Apache Airflow version**:
2.0.1

**Environment**:

- **OS**: Linux Mint 19.2 
- **Kernel**: 5.5.0-050500-generic #202001262030 SMP Mon Jan 27 01:33:36 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

**What happened**:

Seems that pagination doesn't work. I filter DAGs by tags and get too many results to get them at one page. When I click second page I'm redirected to the first one (actually, it doesn't matter if I click second, last or any other - I'm always getting redirected to the first one).

**What you expected to happen**:

I expect to be redirected to the correct page when I click number on the bottom of the page.

**How to reproduce it**:
1. Create a lot of DAGs with the same tag
2. Filter by tag
3. Go to the next page in the pagination bar

**Implementation example**:



```
from airflow import DAG
from airflow.utils.dates import days_ago
for i in range(200):
    name = 'test_dag_' + str(i)
    dag = DAG(
        dag_id=name,
        schedule_interval=None,
        start_date=days_ago(2),
        tags=['example1'],
    )
    globals()[name] = dag
```

airflow/www/utils.py
the pages won't scroll and just keep moving until the last page. Pager also contains
    <first, previous, ..., next, last> pages.
    This component takes into account custom parameters such as search and status,
    which could be added to the pages link in order to maintain the state between
    client and server. It also allows to make a bookmark on a specific paging state.
    :param current_page: the current page number, 0-indexed
    :param num_of_pages: the total number of pages
    :param search: the search query string, if any
    :param status: 'all', 'active', or 'paused'
    :param window: the number of pages to be shown in the paging component (7 default)
    :return: the HTML string of the paging component
    """
    void_link = 'javascript:void(0)'
    first_node = Markup(
        """<li class="paginate_button {disabled}" id="dags_first">
    <a href="{href_link}" aria-controls="dags" data-dt-idx="0" tabindex="0">&laquo;</a>
</li>"""
    )
    previous_node = Markup(
        """<li class="paginate_button previous {disabled}" id="dags_previous">
    <a href="{href_link}" aria-controls="dags" data-dt-idx="0" tabindex="0">&lsaquo;</a>
</li>"""
    )
    next_node = Markup(
        """<li class="paginate_button next {disabled}" id="dags_next">
    <a href="{href_link}" aria-controls="dags" data-dt-idx="3" tabindex="0">&rsaquo;</a>
</li>"""
    )
    last_node = Markup(
        """<li class="paginate_button {disabled}" id="dags_last">