
**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
"""Gets 'state' & returns a formatted string with HTML for a given State"""
    state = attr.get('state')
    return state_token(state)
def nobr_f(attr_name):
    """Returns a formatted string with HTML with a Non-breaking Text element"""
    def nobr(attr):
        f = attr.get(attr_name)
        return Markup("<nobr>{}</nobr>").format(f)  
    return nobr
def datetime_f(attr_name):
    """Returns a formatted string with HTML for given DataTime"""
    def dt(attr):  
        f = attr.get(attr_name)
        as_iso = f.isoformat() if f else ''
        if not as_iso:
            return Markup('')
        f = as_iso
        if timezone.utcnow().isoformat()[:4] == f[:4]:
            f = f[5:]
        
        return Markup('<nobr><time title="" datetime="{}">{}</time></nobr>').format(as_iso, f)  
    return dt
def json_f(attr_name):