
**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
```

tests/www/test_utils.py
self.check_generate_pages_html(current_page=0, total_pages=6)
    def test_generate_pager_current_middle(self):
        self.check_generate_pages_html(current_page=10, total_pages=20, check_middle=True)
    def test_generate_pager_current_end(self):
        self.check_generate_pages_html(current_page=38, total_pages=39)
    def test_params_no_values(self):
        """Should return an empty string if no params are passed"""
        assert '' == utils.get_params()
    def test_params_search(self):
        assert 'search=bash_' == utils.get_params(search='bash_')
    def test_params_none_and_zero(self):